I gotta say this looks quite awesome!
All the elements show total destruction and an ongoing war, beside from the lady, but she has to put more heath to it i guess.
As far as critique goes, i'd say that the soldiers behind her could be lighter grey since they seem to be quite far away. The red color coming from the planes is a neat effect, but it could be a bit more 'dusty' i think, they look a bit flat to me.
The rest is just plain awesome, nice painting and a job well done!
Keep painting and cheers!