Looks promising so far, nice detail on the terrain. Changing the sickly greenish background to something better would probably be a big improvement too. Sceneries look fine, though it's not very clear which ones are just background, and which ones are colliders or hiding places. I'm mostly talking about rocks and boulders in and around the lower tunnel.
If you ever plan on making this into something more than a test - consider improving the layout too. Original Aero is a terrible map IMO and isn't worth remaking just for visuals alone (In all honesty, it's not worth remaking at all, but maybe that's just me).