Tree:

The main problem is the brush is in a total cartoon style, while the trunk is a realism style. Those two objects look seperated, and when together clash pretty nastily; you either gotta change up the brush, or the trunk, whatever style you want to go with.
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I'd change up the brush but I'm terrible at making the leaves and such of a tree. I was lucky that it came out looking that well. Do you guys have any tips or resources I could study to maybe improve my ability to make the tree canopy?
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The trunk could benefit from not being thickly ( seemingly) outlined...
Perhaps a bit of hue shift would make the trunk seem more exciting! Same goes for the folliage.
Overall looks rather clean but it could use some more work !