I really like your shading and colour choices. They're all very striking and reminiscent of a nightclub-type environment, which is very appropriate considering that, well, it's Vinyl! This is definitely a unique take on what she would look like in a more humanoid form. I also like the use of the belts in this; I've never seen someone do it like this before, especially on something pony-inspired. That being said, I do see a few things you could improve on in this picture. for one, the anatomy could use a bit of work, specifically her torso. It seems quite long, especially her waist area. The location of her bellybutton is unclear; I'm guessing it's the thickest point on that line in the middle of her stomach? If so, it's quite far away from her crotch. I'd try to keep the distance slightly more than her hand length, and the distance from her hips to that level slightly less. I also think the line between her collarbone and her left shoulder (the one in the light) is a bit odd, but maybe that's just me. Her neck also seems a tiny bit long, but maybe it just looks like that because of the belt. The line between her boobs and her left shoulder could be a bit straighter. Lastly, the folds in her clothing don't follow her form, and diminish the sense of volume as a result. The sleeves aren't much of an issue, but the blue bit at her hips keeps throwing me off. Overall: The idea and shading are great. Anatomy's not bad, but could use improvement. Good attention to detail; I can faintly see the outline of her eyes behind her glasses!