Wow! The water, tree, and background look so smooth and natural, they're awesome. The edge of the island and the guy himself look a little more stiff and unnatural, so if you're interested in making revisions, that's where I'd start. Ooh, and I think a slight curve in the fishing rod would do a lot to make it look more realistic. Great work overall.
I like the scene and the mood of this one, the reflections on the water look good, some perspective changes on the cliff and some more details and shadows could improve the whole scene. But awesome for beeing an first pixel scene! On your next pieces you might want to start with a limited color palette, take your time.
It is very nice, especially the water and reflections. But one thing annoys me: the black border around the grass and cliff and the saturation of the grasses' color. It is very odd, because while your water has neat details, the rest of the piece looks a bit bland and empty. As if you made both completely separately or something. But nice work overall!
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and use 12 to 20 colors only........................