Ways to improve
remove the gradient but swap it with something like Spectrum Splattered
What I mean is have a line representing each color Id recommend looking up the paint to see what I mean
Next would be to variety in the Pumpkins sticker paints get too boring when they just use the same sticker in various sizes having different pumpkins will help give variety
and last might wanna try darker shades of colors
any of these will improve your paint a lot

Very nice colors.

sticker and gradients