Judging from the hive viewer, so some of these things might be incorrect:
Quite an interesting design of the structure itself. However, the difference in resolution between the grass and the base is quite jarring. Since the grass is at the exact same height as the ground, you also get flickering. Also, the smoke is too black and disappears too suddenly - try setting the "alpha" value in the last segment to 0, and also maybe make the color transition into a more greyish look, that would make it seem more like it's thinning out. Also try setting the variation value to something non-zero, like 0.2, that would add some random speed to some of the particles.