If I was that pilot, I would've placed the flare some place in that wreckage that way it wouldn't blow away and get inside the hull of the AT-AT and wait it out. I believer they carry rations and supplies in the "body" of the walkers. Hell, he'd probably have a lot of weapons to his disposal too if he is the only survivor.
Wonderful concept, you usually don't see SW fanart that has quite a "story" like this one does.
I also like how you took the time to add details that show it as a complex machine, with all the cables, wiring and coolant spilling out of its blasted husk. It makes it apparent that this is an actual working machine, and not just a big hollow model.