Thank you guys for all the support. Basing on what you sent me, I edited the asset. I feel kinda like I'm copying your job tho, so sorry for that, it won't be used for any commercial purpose anyway.
Anyway here it is:
I don't really feel like editing the leaves to make the foliage as round shaped as much as you showed me @dotodrymo. I like the shape of it as it is but I might change it a bit so its not THAT unrealistic. I'll definitely cut some off on the far right and left.
About the lighting: I only saw how flat the trunk only after you sent me your version @aamatniekss, which is awesome. I don't really feel good about the leaves colour pallete I made either. One one hand I don't want to add much more colours but on the other it would help make the lighting more fluent i think.