Looks good! You
could, of course, get fancier with it - smooth out the skin a bit with blending, push the highlights for greater contrast, soften the tattoos (I assume - could always be warpaint) to look a bit more natural, etc. but that's beyond what most would bother doing for a gaming piece. It's not particularly lacking in any area and if it were my model, I might just leave it as it is.
As for the base, a "runic stone" look would certainly fit the bill. Doesn't have to make him noticeably taller if you have him standing on the (at least mostly) flat face of it - a suitably dwarfy stone floor, either pristine or ruined, with geometric/runic patterns carved into it, for example. If you do it that way, the marks needn't be deep, meaning you only have to add a bit of material to the top of the base. 1/16" would be plenty - you could either press the design into textured putty or scribe it into cured plaster.
James Wappel has done a lot of fantastic basing work carving thin sheets of baked polymer clay, either placed directly on top of the base or over torn cork board (everyone loves that "chunk torn out of the battlefield" look, but it adds extra height, which you don't seem to want). Should be able to find some good examples if you dig through the
posts on basing techniques on his blog.