Like the trees stand right now is even less realistic. Trees tend to grow towards the sun. The way your trees are oriented right now looks like you have 10 different suns.
The right tree (the one based on world tree) lacks leaves compared to the size of the trunk...
Also, the trees could use some coherency. There's a tree over there that looks like a palm tree, what's it doing in a pineforest?
p.s. It's not my intention to sound harsh, I'm just pointing out what I find strange on this screenshot. Also try to be more "overwhelming" with branches that start at 1 side of the river and reach the other side.