Man, everybody wants to get their hands on your serpent. Gotta hand it to you, he's got some really interesting stuff going on.
Prepare for the least cohesive post ever written.
I didn't really want to post this because it seems really off to me but I don't want it to go to complete waste, so here's my edit (I have some banding issues going on and the shading isnt very clean but this was giving me lots of trouble):

To be honest I feel like my insecurities with this stem from not knowing where you want it to go. It's a serpent of sorts but it has wings, so I don't know if you were going for dragon or not. I didn't include wings because yours only had one and I didn't really know what was going on with it, and this felt more snakey to me. Scale-wise, a lot of textures really depend on your use of color or shading, so that sort of ties into your thing with shading. I feel like you can get it to read as a serpent without scales, but I couldn't really get scales to work without it seeming messy. You can make your work less flat by using darker darks and lighter lights, but I feel like color choice and lightness were already covered by someone else.
My big issue with your original drawing was that I didn't know what the pose was. Is the serpent leaping out of a coil? Is it just leering at its prey? I just changed the pose to a half turn with dramatic lighting(man, my lighting is really horrible here).
My post is becoming as jumbled as my drawing process was with this, ill just try to cap things up: Pose? Function? Lighting!