I'm just gonna touch on the scene composition since you were using pre-made assets! I think your ground is far too flat and perfect. The birds in the background are far too faint I think, and not white enough to stand out. The tree is behind a pile of rocks, so just seeing the top half of the closest tree doesn't really bode all that great. I think your fog is blurring everything. The ruins in the distance are really hard to make out. I think if you scaled the ruins up and brought the dude closer to the camera, it would read a lot better.
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Thanks ash!