I've been working on some animal crossing tiles and sprites for a couple weeks, and theyve been coming along nicely with the exception of my trees.

as you can see they dont stand out enough infront of the grass and it looks like theyre paints on the ground.
There arent any outlines in animal crossing and I didnt want to use them whilst transferring them to 2d, so that option is out.
I was wondering if there was some way to make it stand out better without darkening the leaves or adding an outline

small mockup example:

the trees just merge with the ground too much

also, character anims so far:

edit-
oh btw Im a new guy here