Not too bad. The smoke and fire looks pretty good.
A couple issues with the vehicles though. The tank is an Israeli Merkava, the Israelis are not in Iraq. Also, the HMMWV you have used (Tamiya HMMWV w/25 mm Bushmaster Cannon) was only an experimental version. The vehicle was not put into production and is not in use by any military. Also, I can't see if it is on the other side or front, but where is the damage to the HMMWV? Right now it looks like it has spontaneously combusted. It needs some blast damage added to it and to have some parts missing or scattered around it. They don't just burst into flames, but blow apart first, especially an unarmored one like you have there. For a what-if dio it is O.K., but the vehicles are not accurate for OIF.
On the dio itself, you need to do something to the edges. I would add a few pieces of moulding to dress it up and cover the exposed foam edge with some pieces of balsa wood cut to follow the contour of the groundwork. Stain the moulding and basla so it looks nice and finished.
Good job on your first dio.
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