I'm not exactly sure how to rate this. At first, I thought it was a field rye, but I discovered it was sand after translating the title. I can definitely see how it can be sand. Still, the sand contrasts with the reddish-brown object, since the object is smoothly drawn (the object is well-drawn as it looks 3D. Is it a car or maybe a catapult)? To me, the sand looks like distorted lines when viewed up close, almost like something I'd expect to see in a horror movie or game, but I have to give you credit for being able to convey the image of sand by doing this (I can see the shape of the sand hills).
Like I said, I don't know how to rate this since there is both good and bad with the image you are trying to convey and a lot of what I'm saying is opinional so I will give you an above average score. I do like the picture and I hope you'll continue to draw.