Another noob better than me. Great.
Kidding aside, lovely mini. Only criticism I can think of is that the base is a little plain. But, sandy wastes might be the look you were going for. A little bit of dead bush, maybe. Or perhaps a larger stone at some location. Just something to add a bit more detail. Since you're on the "cheap", just grabbing a handful of sandy debris from the curb is a great source of different size rocks, at least what I've got. Pick a few larger stones that fit, and away you go.
There's also a stray bit of green, in the top view on the base edge, near the middle. A contrasting color for the sides of the base is often what is done, typically just black. Helps frame the scene, rather than having everything all one color. Course, doesn't have to be that way, so go as you see fit.