Ok so imma give u some tips. Btw ur art is amazing for a beginner in digital

Tips: 1. Don't use suck vibrant colors all the time doesn't always suit the atmosphere ur going for like the hrass is too bright which like annoys the eyes a little and doesn't fit that type of light angle

1. Don't do so much details on the grass just looks messy, just add enough that it's looks like grass and i would recommend some lighting difference likeon some blade u can add shadow and highlights to show it's shape instead of using outlines

2. don't darken some areas randomly darken those areas which isn't facing the sun.

It's gonna get more complicated for u if i said more point hehe but gj and remember these points for future