Thanks for the comments everyone. Replies:
- I agree, that the head needs a bit of re-sculpting. It also needs earlobes. And maybe some facial hair
- I agree that the skin could be a bit lighter, maybe even have a yellowish hue to it.
- I'm not sure about the tribal tattoo, because that's a bit hard to do with pov-ray. I think I'll just skip that
- straps & rivets & uglystuff - I'll see what I can do

- I think the sword is just what is should be like. Maybe the ironfist should be a bit bigger too - at least the spikes

. And should the ironfist be painted in red /some other colour (instead of non-painted metal)?
- It'll be as tall as a horse (which was my point of reference in the first place

)
- I think that the current gut-plate is just good in size - clearly visible and noticeable.
Also, making the head more human-like, it could be used as a samoan swordsman

j/k
About other ogres:
- leadbelcher (an ogre carrying a cannon barrel!)
- an irongut with a huge 2-hand weapon (I was thinking about a huge rock attached to a woodtrunk -type of sledgehammer-weapon)
- heavily armored (= helmet and shoulderplates) ogre bruiser (= tyrant)