Thanks for all the comments

I have chosen to give the shark mouths to the assault marines, since they need to look a bit more dangerous.
I was inspired from looking at a couple of old pictures. Especially this one:

The Flesh Tearers Jaws of Doom assault squad.
And besides the black stripes on the helmets of my Blood Angels, I guess they just as well could be Flesh Tearers. I don't count on doing any Death Company or such anyway. If I am goinf to play any 40K verseion beyond RT I will probably just play these marines as vanilla marines anyway (or mix units as I please with the Angels of Death codex 2nd edition, but no Death Company).
Sooo late eighties, I can almost hear Def Leppard and Roxette when I look at that photo 
Cool stuff! I dont recognise the psyker in the middle left. I am assuming that its an old Citadel, right?
I can almost guarentee you that I have been listening to Def Leppard and Roxette at some point whle painting these... on vinyl of course

hahaha
The psyker is from the old Adventurers range. Apparently she was originally supposed to be a civilian in distress.