Just one thing that I can point out - With a setting sun there would be a lot more light bouncing off areas, to me there's not a lot of strong shading/lighting here. If you create another piece like this take a look at some photography and you'll see how much light bounces off. That's all I can say the rest is well painted out, keep up the good work!
I appreciate the critique! The lighting here is definitely suspect. I'll be sure to use a ref if I go to finish this one!
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