I think what makes this look as terrifyingly awesome as it does is the fact the volcano seems relativly small and close, like it would pose an instant threat the second it starts going off as opposed to real life ones that can still be large and broad enough to give people a chance to escape. Here though it seems like a short canoe trip across the river is what seperates you from the foot of the volcano, I sometimes have had dreams like that
I think that my main mistake in the proportions of the graphic. Had to add a minimum of fog on the background of the volcano is not so dazzled by the eyes so close to the volcano and made to feel that he is on, and thus it is that would be larger
I'd like to assume you already know how awesome this image is, but just in case you don't this is absolutely AMAZING! I'd buy each and every one of your works as huge as the walls in my house to cover every one of them.