Someone told me to try less colors. Limiting oneself to something like 4 colors/shades increases the rate of learning. It also motivates a person to try a bigger grid size. If you can guess every element in the image below without considering the title, it is a good pixel art.
The image is made with only with white, black and 2 shades of grey. It is then, scaled 2 times. After that, I played with its temperature and applied a little-blue tint.
Although, I do believe that there are a lot of mistakes. For example, I should have used some black on the palm tree as well. The far-off palm tree looks a bit too pixellated. The plants, although seem visible, have no shadow of there own. The shadow of the rock in the bottom right seems a little miscalculated.
Obviously, there are more mistakes. But it is much more organic and natural-looking than my other pixels. So, let us just enjoy the view!
Oh and by the way, this is not made in GIMP. This is made in Pixly, an Android Pixel Art Editor which is, in one word… awesome.
Grid Size: 256*128