I just finished Forge World's Kharn the bloody. When first seeing the model I felt something about the pose was a bit weird. His left arm, holding the plasma-pistol, was pointing downward. This didn't look right when his right leg is pointing away from his body. It somehow looked like he was thrown of balance. I fixed this by giving him a new arm pointing the same way as the leg, making his motion look more realistic.
Giving him another axe, made him look a lot more brutal. The crest was added to make him look more like the descriptions and artworks of Kharn during the Horus Heresy.