One of the best things about the Forgeworld character series models are the scenic bases they come with. I was impressed with Angron's base when I painted my own copy of him, and enjoyed painting it again just as much. It is areal pleasure painting tiny dioramas like this.
Another thing I carried over from my original version of this model was the use of World Eaters on the base. I was very close to putting a Sons of Horus marine on the base as well, but I think it may have added too much interest and distracted the viewer from the central model. I think the focus should be on Angron alone. The marines he is slaughtering are just in the way.
You may notice my use of light blue, orange, and yellow tones. This is intentional, and will help Mr. Anger stand out once he is added. Once I add blood spatters the diorama will come to life or death as the case may be. As a bonus, blood will be used to carefully conceal imperfections.