I think the point of both color edits is to show you that your colors are too 'basic', in a mental kind of way, and thus neither realistic nor visually striking: you need to get rid of the 'grass is green, earth is brown, stone is grey' mind set.
Look at reference images, or actual nature and look at the true colors that are actually there, especially those which are 'at the edge' of perception, like blue/purple shadows.
You have 19 colors, the last one (grey) likely accidental as it covers one pixel only (I couldn't find where). A piece with that much detail can have 32 or more without shame (if needed, of course).
Your color ramps (greens, browns etc) have very little hue shifting, they are disconnected in both color space and pixel space. Also you should avoid the use of pure (or nearly pure) greys: stone is rarely neutral. There are no dark tones.
Think of your palette as an interconnected whole, and recycle colors throughout the piece. More about this
here and
there.
The composition is good, but it makes the tree more the focal point than the building, which kind of contradicts the color balance (and maybe your intentions): the viewers eye is a bit torn between both.
