well done mate!
You asked for some helpful comments and I want to help you. I noticed three things.
The mouth of the snake, the breast of Jane and her fingers on the right hand.
1. Try to lift the emerald in the snake mouth from the rest of picture. -a glow or a shadow should work.
2. From the last drawing, I have already noticed that you work with short lines. That's why your character has a edged breasts. try long solid lines, dont make short ones.
3. Last but not least, the fingers on the right hand. they are coming from the wrong direction, if you make your own hand like that, then you know what I mean. Exactly it does not work ... or it should be pretty painful if you can do that. ;D

keep it up!