I would say just sculpt them to the body as best you can with the symmetry tool on, that's how I usually do it.. Its super time consuming but trust me the outcome is very rewarding!!!!
@ALilRotten
Thanks man for your input. I guess I will have to figure out how to use blender or remember how to use photoshop...
Tbh I was too lazy to use any photo editing apps and was hoping to see another solution XD
@Literal i already know all that, i have such an asset from the friend i mentioned above. the fact they was able to rip the avatar recently is proof that it's possible. i'm not saying that it gives the original files, but enough to take parts of it away and reconstruct manually.