This is a good study in proportioning. I'm kind liking it.

The light source is from the right, so the Earth should be flipped accordingly.

I know the Earth looks way too big and the craters way too small but it was not meant to be realistic. More of a, Dog in a space suit standing in front of a wallpaper, thing. But as CMYK46 mentioned, I messed up the lighting and positioning a bit

Thank you for the comments! I'll try and fix it ASAP

if we can see the curvature of the moon then we should see the same shadow on the earth (easy fix)
good luck