I was going to mention the amount of damage but someone else did it for me. That modified shredded tyre looks better, but the damage is still pretty light, I reckon. It's unlikely that an anti-personnel mine would have been placed on a road; more likely one with a bigger bang, which would have ripped the front off the vehicle at least.
But one fundamental flaw I noticed is that the limber is heading toward it's gun. This means that it must have left the gun recently, and probably travelled down the same road before returning. The road isn't wide enough for the vehicle to have missed the mine the first time, so someone must have placed it there between trips. Considering the proximity to the gun & crew, it seems unlikely that an enemy would have been able to sneak in and plant a mine on the road. Not a criticism; just my observation.
One more small observation if I may. A blast that's strong enough to take the wheel off the vehicle would probably leave a reasonable sized crater in the road.
Nevertheless, a nice, simple diorama with a story... well done. Add a few figures in realistic poses and it'll bring some "life" to the story.