I'd say it could use some more outlines personally but I think it still works aesthetically. I'd also add some shading on the horn to make it look 3D like the scales. The purple scales might need a slightly darker purple outlines to help show where one ends and another one begins. I really like the colors so nothing I'd add to that. Also since the head is a such a similar color to the rest, I'd just add a bit of shading to areas that wouldn't be in the light to add some depth, like behind the tuffs on the face and behind the horn. These are just some design suggestions, I think it looks great as is though.

Honestly the only critique I have is that the scales are 3D and the rest isn't. It's a interesting look so you can totally keep it, just throwing it out there that shading might help to pull different parts of a drawing together.

I usually use the hightlighter tool. It makes it really easy to layer shades without effecting whatever's underneath as long as it's darker. It would work for the horn.

Probably.

Np

Yeah like I said, it works good I would just suggest some touching up :)