Nice work. Not being an artist, I hesitate to criticize. It seems to be unfair since I don't have a dog in the fight.
That being said, I just have one nit to pick.
Gamora has a yellow patch over each eye, at least she did the last time I saw her.
I only mention it because she is a special favorite of mine and all too few pictures of her appear.
Thanks for a good drawing which I intend to add to my collection!
Do you plan to color this work?