I wouldn't really consider this reasonably realistic. The sand dunes aren't shaped properly at all, right now it looks like you just have a few bumps in the middle of an obvious 3d skybox. I know you said you weren't being totally serious, but like you had one job to do in this map. In the next release you should try shaping your displacements more what people would expect a desert to look like. It's a bit more work sure, but I would look better and imo it would be more fun. Also try getting the proportions in your 3d skybox to blend more in with the playable area.



Also your lighting doesn't seem hot enough. I get its a cloudy skybox but it just looks cold (also the light is facing the wrong direction of the sun). It could really benefit from more ambient lighting to eliminate those really dark, almost black spots. The blue ambient lighting in that last pic I think would be a nice touch. Either you have little to no ambient lighting or you have a leak in your map.
I hope you don't think I'm trying to rail on you, its just when I see maps as simple as these I really do like to see the bit of extra effort. Plus in this day and age you can make pretty detailed displacements and not really have any impact on performance