I think U could improve it with some rust on the gutplate and more highlights .. Maybe a stain of blood on his sword so that it looks like he's in battle !
This model looks clean and the painting is strong, but you could really improve it with some finishing touches. Try basing it, for example. Also, just a little more highlighting would do wonders for this guy, especially on the hilt of the sword, the pants and on his exposed flesh. Good work so far, my advice is don't stop now!