My early attempt at this model. I used foundation white which was the only white I had at the time and I feel it didn't work well. I have since got Skull White :D
I like it. I was a little confused at first when I thought the Tyranid was carrying a bolter, but then I saw the marine's head and put it all together. Ny friend gave me a Harvester of Souls to paint for him and I hope it comes out as well as yours did.