As a fan of Warhammer, you truly have captured the good side of SpaceMarines. They're aren't just war machines but they are soldiers fighting for the Emperor and mankind itself, they're saving individual lives!
I like Ultramarines so I belive that he is Ultramarine. But in fact it is no neccecary to know -- that is the pint. The only thing that matter -- is that he is the Emperor's Finest, protector of Humanity!
Good to see the more... human and caring side of the Space Marines, it's kinda cute. And to be honest, reading and seeing nothing but uncaring, dogmatic SM gets kinda boring after a while, even if it is fitting for the theme of Warhammer 40k. That's why my favourite Marines are people like Garro, Torgaddon and Loken, the individuals.
Saving a girl's life, and striking a fabulous pose while he does it!
Love the detail on the Space marine, could use a little bit more going on in the back though, like some more buildings or a hive fleet hovering above. Also, this is more of a personal thing, but I can't imagine the common citizen wearing jeans and hoodie in the 41st millennium. Thematically speaking, I thought they should wear either victorian-era clothes or medieval germanic stuff.
Still, pretty good effort, I like how the paint streaks on his power armour are done such that they indicate motion as well. :3
Of course I'm no expert on the matter, I only suggested since the aesthetic for 40K tends to be described as a kinda gothic/cyberpunk hybrid. I tended to imagine the citizenry to be in plain rags or ornate part renaissance/part 1930s/part fantasy gear.
But I digress, Games Workshop was never really specific on details beyond military stuff.
Space Wolves are good guys too. You know, on the First Armageddon War Logan Grimnar confronted Grey Knights grand master for killing people who where involved in the fight with daemons. Blood angels are also nice, just a bit crazy.