Very cool build Liam. I love the use of the red Onua Nuva mask. It really suits this build.
Though the lighting is a bit dark for a build with black on it. It does make it kinda hard to see. I'm a little hesitant to say anything for sure, but it kinda looks like the thighs could use a bit more beatiness, they look a little gappy. I think I'll need better lit photos if I'm gonna be able to comment further about the build. But its overall a neat MOC.
For some reason my camera picks up red badly on my black background, photo editing that I use on pics doesn't seem to help that much There's similarly bad lighting on the Red Baron for the same reason. Yeah, I got a couple of free Toa Nuva masks and they're way too big for Toa sized MOCs. They work absolutely perfectly on Titans though
Red is a very saturating color. If you up your saturation its the first color to get blary and intense. The problem here is you've got black parts on a dark background. That's like me having white parts on a white background. Melanthios V.1 has that, and while its not white on white or black on black, sir Richard's photo shoot has the same problem.
I unfortunately don't have any of the nuvas in other colors, just the toa's. I've got some mata masks though.