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I think your technique is looking really good! At this point, your biggest problem seems to be the proportions of the tree. Here's a quick edit with a shorter, more complicated trunk:
And here's one with the leaves moved to make the canopy look more like a 3d mass of leaves:
You could go longer with the trunk, but I think that more life-accurate proportioning could really boost this asset.
And here's one with the leaves moved to make the canopy look more like a 3d mass of leaves:
You could go longer with the trunk, but I think that more life-accurate proportioning could really boost this asset.