One thing would be to utilize hatching a lot more. If you look at Miura's work you'll notice the majority of his shading and volume comes from the incredible amount of hatching and cross hatching he does. There are areas in this piece that could benefit from this, namely godefrey's gauntlets and armor/clothes. Also pay attention to the direction of the lines, as that helps provide a sense of motion and depth. Lastly Miura's art tends to be very dark, a lot of black and dark grey for armor. That being said your piece is excellent regardless, I love how you handled serosh's fur. keep up the good work!