Every element of this picture is fine as far as pixel art goes.
But it's not researched.
I think you need to do more work *before* you start to draw.
You need to structure a scene. Learn about construction and focus points. Not just draw some people and then draw a background, some rocks, a waterfall.
Waterfalls do not create tap water droplets, the water falls from so high up they create mist.
Rocks near waterfalls are licked smooth by the falling water, they're not these nice - but invented angular rocks that you drew.
On the human level, why are three indian girls flashing the viewer. Neither of the three poses seems at all comfortable, they look like three separated pin-ups, battling for the attention of the viewer. If you wanted to draw girls that are just lounging around in the sun, you should have referenced more relaxed posture.
This art suffers from what a lot of your art as I've seen it suffers from: you draw, but you don't consider the implications of what you're drawing first. Pixel art is a fun medium because you can do something fast and it can look finished, but it doesn't mean everything should be done fast. Especially preliminary studies before a single pixel is placed.
Be honest to yourself: do you start your image by opening a blank canvas, looking at a picture and then placing the first pixel somewhere? You might want to reconsider this approach.