I don't see what you mean by shakey lineart, it looks fine to me. However, there's some other stuff you can work on. Anatomy & Proportions: The head looks like a big balloon. The ears and the snout should be bigger, and maybe move the eye more to the right. Also, the neck looks unnaturally long. Colors: I take it the unicolor line was intentional, but I don't know if it works. It looks nice on the wings and the leaf, but at her neck, it really blends with the base color and the hair, creating an almost solid looking blob. Also, it heavily contrasts with the dark shade of pink, which you should avoid. Also, make the background contrast more with Fluttershy so she pops out more.
However, there's some other stuff you can work on.
Anatomy & Proportions: The head looks like a big balloon. The ears and the snout should be bigger, and maybe move the eye more to the right. Also, the neck looks unnaturally long.
Colors: I take it the unicolor line was intentional, but I don't know if it works. It looks nice on the wings and the leaf, but at her neck, it really blends with the base color and the hair, creating an almost solid looking blob. Also, it heavily contrasts with the dark shade of pink, which you should avoid. Also, make the background contrast more with Fluttershy so she pops out more.
Uh... (