Drawing a light rough sketch before darkening the lines takes practice, definitely -- I still have a really, really bad habit of trying to keep from pressing down too hard on the paper, and succeeding at first when I'm conscious of it, but then gradually starting to press too hard anyway without my noticing when I get too involved in what I'm sketching. (Part of why I generally don't draw traditionally anymore is the issues I tend to have with erasing and fixing mistakes, but that's a different story.)
Aside from what was mentioned by others, I can't tell if the weird brightness on the lines of the front legs is from the camera flash or not? It looks really strange. Also, I think the left eye is slightly bigger than the right one, which, since Eevee's facing front, makes the face look a little lopsided.