the head is too forward from the neck, but you kinda have the head shape right. i wish i could show you like a vid on a review bu okay, time for WORDS
so like if you build the head out of two oval looking sphere thingies, in anime or realsm or whatever, it tends to have a very human look. so like from the front is the oval , the middle line is the eyes or brow, depending on how your character looks. i dunno, maye he's jacksfilms and his forehead beghins there. 3/4 the back oval pops out kinda, the back of the cranium. from the side though, it's kinda like to ovals, one horisontal and one vertical, meeting at the forehead. equal length, perpendicular to each other. the necke begins not horisontally. the head looks more spherical here though, which is fine in anime. in either case, the neck is too far back so it looks like it flatly meets the cranium, plus she like has a real long jaw. the nec should begin like a ummmm 6th or 7th of the through the horisontal, upper ovel. am i making sense? i guess you could interpret her head as technically fitting that bill but her hair is MADDDD thick yo
the pose is okay. it works. what you need is gesture though. practice gesture drawing, your characters will become fabulously expressive, i promise. also i like that renaissance hand pose YOU DAVINCI LOVING FUCKER YOU.
background is imprecisely painted. remember, cabinets are blocky things and they look blocky, still, ded. i guess. whatevs
anyway i like the shading, obviously you put a lot of work into that, i can tell. it could use more contrast though.
try to organically do gradients with transparent brushes, the airbrush/vignette thing looks too mechanical
overall 2.75/5, i like and you did some things real good. i hope this helps, maybe im just dumb idk. best of luck