Sorry I can't help but b*tching about perspective, I don't comment for that purpose but I'm while I'm at it: there's a slight angle mishap on the mouth, I believe.
Now, I'm quite fascinated (in general but it gets strongly demonstrated in your paintings) by how mastering color shades and those "shiny" white spots produces an effect of volume better than real. I was reflecting on this while my eyes got caught by the one round whit dot on the left butt-cheek, hence my question(s): is it here on purpose (surely)? and what purpose does it serve?
Hey there, thanks for the comment. I looked at the mouth, and you might be right. I was trying different expressions and ended up with the wrong one
As for white dot, It is a clumsy mistake, nothing more. I use PS for work and I am quite heavy on keyboard shortcuts. What (most likely) happened there is i was holding my pen down pressing the space bar to get the move tool working while my brush was still selected and a single, 7 pixel white dot ended up there, without me noticing. I will fix it all in the final piece for sure. I am actually putting the book together at the moment with all these sketches and paints and am touching up every single piece for it, making sure everything looks its best. Sorry if it let you down on this one
Thanks very much for answering my curiosity. ...And on the subject of the mouth. I'm not a big Photoshop user myself, but keyboard shortcuts are the way to go! Even if well, I know all so well the frenzy of quick key presses that go out of control or timing.
Good luck for the long (tedious?) work of polishing the sketches. I bet it feels different for everyone but coming back on a piece that had previously been considered "finished" must always imply an amount of discomfort, fearing to alter the original intent.