It's cute.
When doing lineart on Lascaux I like to use the airbrush on low/med opacity and flow and start with thick lines then use the eraser on low/med opacity and flow and shave the lines down. That way I get thick and thin and tapered lines as well the lines are smooth and not jagged. Raise the mouth higher, not so low on the chin. Lower the eyes and make the nose bigger. Round the chin, it's too poiny. As well the shoulders are too wide, make them smaller and rounder. And maybe make the head a little bit smaller. As for shading and highlights, well one step at a time. Keep it up, you'll improve before you know it. Just remember to keep practicing and look up some books on anatomy. Welcome btw.