Oof. That’s difficult and kudos for not wanting to just colouring the roto.
Taking 4) first, try adding static noise to a duplicated layer of the fingers. Corridor Crew on Youtube recently used this technique to improve the Scorpion King’s appearance in the Mummy Returns.
https://youtu.be/KH1V6CHO1Jk
3). I think you either colour the fingers or apply textures and I you can’t track then you might be stuck. One option you could try, is using the fingers as a displacement map for a blood texture. It wouldn’t track the texture into the fingers, but it would give a sense of movement and wrapping around the gloves.
2). Fractal noise can add texture to colour, if you go that way and see 3)
1). Tracking something like this feels really difficult, but you could try AE’s mask tracking and see you get anywhere. Failing that there are pay-for plugins like Red Giant’s King Pin tracker that might help. I’ve not used it, but it looks pretty good.
http://www.YouTube.com/ShiveringCactus – Free FX for amateur films
https://shiveringcactus.wordpress.com/ – FX blog
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