Keep practicing. No joint on a circuit board solder pad you’ve shown is acceptable.
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that looks pretty good. cut the wire back so you get a clean fresh piece of copper wire and give it a twist to keep the wire from spreading out when you solder it. try not to squash it with the soldering iron or you will just damage the tip, if its not melting then add solder to the tip to help conduct the heat.
il give you a 6/10. it would work but can be improved, the more you do the better you will get with experience.
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You made my night! Finally a “good!” What I noticed is, firstly I added some solder at the place, and then tinned the stripped and twisted wire, and then I melted the solder at that place and dipped the wire into it and kept the solder warm for some 10 seconds, and then removed the iron. It solidified and I was shocked! It was so smooth!
Yes, more I will learn by practise
twist the wire after you strip it, before you tin it, that will stop it spreading out when you tin it.
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Three bright connections in a line! (Is this “acceptable” @Yuri_Rage sir? )
I also tinned the ESC:
While tinning the ESC, the flux inside the soldering wire spoiled my mood! The flux of brown Black colour you can see at those places doesn’t look good. Otherwise the solder looks smooth. The main battery power places of + and -, there also the flux came out of the solder wire and filled up that place. That was soo much flux that it bridged the + and - places. But no conduction occurs through flux! So I am safe. More good it will look after I join wires there. Now I am planning to extend the motor wires. My motors has different wires, so that European splice which Yuri sir told to me, that will not work with motor wires. I will have to use the intermesh technique. 2 old motors are there on which I practised and this worked! The connection was super hard. But I really think that I did the worst tinning at the + and - places there … The burnt flux, improper solder there… That doesn’t look good … may be when I will join the wires, everything will come at place?
Use Isopropyl alcohol and a swab to clean it. There are more effective flux cleaners but this will work fine.
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This makes no sense. Solder doesn’t care about the unladen airspeed of the wires, whether African or European. Splice them and solder them.
Your joints look acceptable, but I think you are applying heat for too long and using too much solder in general.
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What about the ESCs that say Nee?
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You must bring them a shrubbery.
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Now where at this place I will find this isopropyl alcohol? A theft at my coaching’s organic chemistry lab will work? 
.
, actually, these motors wires are a kind of like, if I rotate them like that required in that splice, the wires break, the copper strands are somewhat thick and break on rotating, as I tried to twist them like that, and the stripped wire broke on twisting! As geofrancis sir also said, these motors wires are some glazed copper.
I didn’t understood the meaning? ESCs that say nee means?
Means?
Don’t worry about it. Yuri made a joke from an old movie that is giving away both our age and our off-kilter sense of humour.
O no… I will never understand the typical foreign english. I searched and found that you were taking jokes from monty python and the holy grail. But I even didn’t understood the meaning of your this reply… "Giving away both our age… " Means? Now I want to know what all means?
(Btw, once when I grow up, I really want to meet all of you, Yuri sir, you, Juergen-Fahlbusch sir, amilcar Lucas sir etc… in real life … at your home places… I even don’t know, people who help me so much, how do they look like? How do they speak, their homes etc!)
Yes, you are welcome to visit and chat, I’ve a guest room.
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I don’t know about India but you can get it everywhere here. Pharmacy, grocery store, home improvement/hardware, Amazon… If you have a choice get the highest percent alcohol.
Even the liquor store…
I always keep a bottle of Everclear or a cheaper equivalent on hand for cleaning tasks. 95% or higher ethanol, which is even better than isopropyl for certain tasks. Not available in all US states, and probably less available in certain other countries, but good stuff (for everything but consumption 
).
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As the test soldering now looks better you still need to practice more and reduce the time of heating your electronic boards. By heating them for 10sec or more you can destroy them.
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I think I can ask at medical store, otherwise no one will ever be having isopropyl alcohol/ethanol here…
So, if I just drop the alcohol over the flux, will there be a reaction and then whoosh! All flux disappeared? Or will the alcohol liquify the flux and then I will wipe it out with a cloth?
Hey!! Do you think a boy like me going at “bhayanak thandi angrezi daaru” shop! (Extremely cold english wines shop) My parents will push me out at street! 
I will try to ask here and there for alcohol… But Not at wine store!!!
Surely one day after 10 years(hehe) (or at least 8)(hehehe)
I am serious. I will also bring a bottle of everclear for (stomach) cleaning purpose 
Saturate a swab or cloth and wipe the flux off.
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