[Vega001]

I suggest adding more grass detail, specifically more tiles such as fences, rocks, etc.
I suggest adding more sand detail to a lesser extent than the grass detail.
I dislike your unorthodox use of the dark sand.
I suggest more experimenting with the waterfall to make it fit more nicely.
I suggest a different approach to edging out the medium (between shallow and deep) water beneath the waterfall.

Good use of layering and cliffing.