Not bad, mate! I love the little subtle glow coming off the energy bob on the sword there. Very well done.
Some constructive criticism:
If you're a big fluff fan, Deathwing terminators are actually more of a bone-white than white-white. Feel free to paint them how you wish, however. If you want to go more of a bone-hue, going over the whole thing with a sepia wash (the
GW "Seraphim Sepia" shade paint works just fine for this) will do the trick without you having to repaint from scratch.
CC that actually matters now
There are actually little skulls in the robes on the bottom, that look like they were just the same green as the robes. You don't have to pop them out, but I feel like it helps complete the model's aesthetic.
Something kind of cool and interesting you can do with the rope to help it feel more velvet-looking rather than just a dark pink is to use a slightly coppery red to highlight it, then use a final slightly brighter shade of pink over that. It's what I do on purity seals and sword grips, and comes out pretty good. If you're using Citadel paints, Wazdakka Red and Pink Horror do the trick.
I see you've got a white dot on the lenses of the gun and the bionic eye, which is cool as it definitely helps. To really sell the lens flare look, though, you need a lot of contrast. What I've started to do is start with the lens totally black. In just one crescent-shape, I paint in the color I want the glass to be, leaving what is essentially a black dot in about a quarter taking up a "corner" (as much as circular objects can have corners?). Make a smaller crescent inside that of a shade brighter, and if you can do it thin enough a itty bitty tiny white crescent inside of that. Then, a single tiny itty bitty white dot in the black part of the lens. It's pretty easy to do and adds a lot of depth.