Wooooo Demon art!!!! You know I love it, especially the shading. And I think your faces are getting much better. Two things to pay attention to 1. your arms are a little wonky. Maybe they're too short or something? But something is off about them, I struggle with arms so it's something I pay attention to. 2. EYES!!! They're looking good for the most part, but I think sometimes you underestimate just how round eyes are. Like in the second to last picture especially.
This is one of my favorite eye tutorials so I thought i'd share it with you http://www.deviantart.com/art/Eye-Tu...urce-327176361
Good luck and I'm sorry my part of the art trade has taken so long ; - ; I get distracted easily and forget about important things. =-=