Every day we find better brushes online with which we can improve the realism and quality of our designs. Specifically, if we search free and free to use brushesThere are many websites and blogs where we will find altruistic designers who offer their brushes for free to other colleagues and design fans.
At Naldz Graphics they offer us 29 leaf brush packs for Photoshop in a great compilation post that they have made searching in different sources. We can download them all for free by clicking on each of the links that have been left in the original post that you link at the end of this article.
In the compilation we can find leaf brushes for Photoshop of all kinds, more realisticPlus synthesized… and of various shades. I am sure that some will be the ideal for your project with plant elements.
Source | 29 leaf brush packs for Photoshop