These look great. I like that on Goriel the Genestealer isn't very bright so that he doesn't distract from the terminator. Think I will have to do mine like this.

I think the red Blood drops do work well, I probably should have done mine red now.

One thing I'm not to keen on though is the silver bit on the Purity Seals. This just seems too bright to me and doesn't seem to fit in right. I also agree with Brother Weasel about making the Heavy Flamer look used.

This is a picture of one of my melta gun barrels.
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I think I used Dwarf Bronze painted over Boltgun Metal. As I worked up to the end of the barrel I added more Chaos Black to the mix until it got a very dark colour around the end of the barrel. This could work for your Heavy Flamer.

Are you looking for other ways to do parchment? I think yours looks good. I may just add a bit more Bleached Bone to the edges. I use Snakebite Leather as the darkest colour on mine, but I don't think that colour would work on yours. You can see mine on the other Terminator thread. It's simply Bleached Bone over a black base coat. Then Snakebite leather in the recesses and folds. Then I was most of the parchment in Snakebite Leather then tidy it up with Bubonic Brown. Finally go over the raised areas with Bleached Bone again.

One more thing I would suggest is may be adding something to the eye lenses. You have done the gems really well but the lenses look a little flat compared to them. It looks like you used Goblin Green? Maybe just add a bit of a darker green like Dark Angels Green to the back of the lenses then add a white dot onto that.

I really like the metal work on your weapons. It looks nice and dark. Did you use a black wash to get it looking like that?

Also that flask is fantastic!

These are great models and I'm looking forward to seeing your other ones.