Yeah.. GW's attitude is despicable some times.. why can't they be happy we like their stuff? (Like Firaxis/Gollop being happy we like XCom!) But I think it mostly deals with unlawfully distributing their stuff. You can't give people something for free that they are trying to sell (rules, or even rumors that cover rules/models that they will be trying to sell later) and you can't sell your own stuff that is in any ways related to GW IP. But in this case, this is GW-inspired art being given at no monetary gains. I have not heard of them going after that. (otherwise there would be no fan art, no pictures of people's models, etc.)
Back to the awesomeness of this, I do echo Dioxine's comments, and the blurriness is also present in the marines themselves. Also, although the tiny hawk is cute, it's supposed to carry 30 marines. A storm raven would fit much better (and in fact, besides the huge gun, looks quite a lot like what you have now. It might save you some time to just switch?)