I hate the guy who made the first pixelart. Also, pixelart is easily done by programs. Therefore: Pixelart = Sucks.
With that out of the way, your cave consists of some straight (boring) walls, with water on the floor. Concept: Yes, the concept works, but the flat walls makes it boring to look at, and simply not worth a builder application. Get inspiration from the internet, google "Minecraft Cave", and see what you'll find.
It's a no from me, for this build. Keep building, and you'll might get there. Good luck.