This is pretty good

Heres just some tips ^-^
-Give Amethyst a darker tint of purple on her shirt, or else it looks like her hair is merged with her shirt xD
-Make Pearl taller and a lighter shade of blue, or do a very light shade of yellow.
- Try to roughen up your lines, aka try to do a neater job or something.
- Also lighten up Steven's skin and make Rose light pink.
Otherwise, it's a great drawing!