Looking very nice indeed what with the subtle, silky highlights. The metallic tubing looks a bit ropey compared to the rest of the paint job though and I think they could benefit from some extra work.
To make the wings on his chest armour pop more the skull in the centre could perhaps be done in metallics too. Not sure, but as it is it feels a little flat. I guess the rifle will mostly cover that area though.
About the rifle - bright red on Dark Angel weapons is something that has always bothered me anyhow, and as this is a scout sniper (who relies on stealth) I think it\'s even more important that the red is at the very least severely darkened. It can still be red, but start with a much darker tone, something almost black and work it up, with bright red only used on the very sharp and fine edge highlights.
Having said that, any sort of garish colours on Marines is a no for me, it just seems silly. It\'s why I chose Dark Angels over something with bright \'shoot me now!\' armour like Blood Angels or Ultramarines actually, so maybe this is personal preference more than anything.
Have you considered some camouflage on his fatigues or is that too much effort?
Oh, and the red pouch on his back. Is that definately something he should have on him. It looks to me like it could be a storage pouch for a Heavy Bolter magazine.