It's nice to see that even in such a grimy and choking post-apocalyptic world people can enjoy themselves a bit despite it. And the world can't be that ruined if the trains are still running. Anyway, you did a lovely job on the pair, and I really like how they get to stand out against everything covered by the haze. Besides highlighting them it highlights their mood. The human seems to be enjoying the thrill even as she walks unsteadily; the bunny seems more cautious even as she seems to be keeping better balance.

Neat job on the scenery too. The infrastructure has some nice structures with the rougher blocks and simple ladders making for a nice juxtaposition. Also, the perspective makes gets across how high the ladies are very nicely. Thanks for proof that there's always something to be a little happy about.