I tried something different so I gathered all my old grey pieces (most from Rahkshi sets)
and came out with an interesting body (think Atlas from Portal 2).
On the contrary, I think that the moc is an interesting concept and build. I just need to get the negative out of the way and the build is jus a generic build. But the colors and the black fire sword is cool. I think you should bulk him up and complete the build. This would be acceptable if it was a WIP but as a completed mov, this is not very good. But keep on building this guy up and he could be really cool.
Add some black peices as the bones and body and add white and grey armor so the sword blends in more. I recommend building a custom body that can bulk up the torso and fill in the other body parts. But as I said, I like the concept. So get to work friend.
Here’s v2, not sure if I like it, maybe it wasn’t a good Idea to add the red-orange. I don’t want to widen the body as the point of the moc is to look skinny and gargoyle-ish. I’m going to rebuild it soon so leave feedback. (also, what greys would be ok to use with old grey? I don’t have very much old grey, but I have some new grey or gun metal.)