Not sure what I can suggest other than using thumbnails linked to the main images, and compressing the images (they'll at least halve in file size without losing obvious quality quite easily)
For the texture, does the blood overlap the colourable areas? It shouldn't be too visible, as blood would be thin and wouldn't cover all colours too well, but it shouldn't stop because of team colouring. It might do that already, but because you've got a dark colour then I'm not sure.
Other than that I don't know what I could suggest, as it's not the kind of skin I'd ever use. Apothecaries carefully remove gene-seed so there wouldn't be much blood there, and IIRC then Marine blood clots very quickly (even severed limbs, I think) so big splatters like that wouldn't occur from medicine. If they did, the Marines seem more like the type of soldiers who'd keep themselves clean.
Still, if you like it then I'm sure there'll always be other out there who think they need a bit more blood and gore
*Splitting off to its own topic*