When any air to ground bombs are dropped the explosions and smoke are incredibly small for the payload. Explosion should be at least 3 times the size.
As for smoke. There should be a plethora of smoke coming from crashes and explosions. extending MUCH higher and wider than currently implemented.
Here is a clip of what seems like 2 Jdams in an airstrike.. Notice the size and smoke coverage after the fact as well.
These should also burn for a while (at least 10 mins)