what do you mean finish your sprites

[Hoeloe]

I'll say the lines look mostly good, and you've taken the important details of the design without trying to cram too much into it (I immediately recognised it as a Rathian at least, and it doesn't look too busy). I'd definitely take on board Previous' comments though. Contrast is important, and dithering is an incredibly difficult thing to get right, so try and avoid it if you can unless you're absolutely convinced you can do it successfully.