+1 for addressing normals issues. On some they even look inverted, and generally too strong. I will say that photosourcing foliage is often one of the worst things you can do - you’re much better off modeling high poly versions and then baking that to a card to get better normals and curvature for your planes.
These aren’t bad as placeholders, but I wouldn’t put anything of this quality into a final game with those sorts of rendering issues. I don’t mean that to be insulting, just to be honest. You can improve these and I’m sure in doing so, you’ll get more sales. Good luck!