Anything I should improve upon or need critique for?

[distant crystal]

I drew this piece and want to know if I need to improve on anything, (like the hands, anatomy of the pose, or shading). I would be very thankful for anything critiqued, so that I can improve.

[tight shell]

this might be a more personal preference thing but i dont recommend using an airbrush for the hair. it looks out of place, use a harder brush. hair doesnt have that texture so it doesnt make sense to have that haze yk?

[jade phoenix]

head is too much to the left, and is too small. the hands should be able to grab the face.
also, the left forearm is really short, or the perspective isnt correct on it

[distant crystal]

Thank you so much for the tips and critiques

[true igloo]

the thumbs seem to be misshapen