Hi Nix,
I think you went a little over the top on the dithering here. The palette is nice, however the differences are a little too subtle, I think. I'm not sure if that orange works, either. It doesn't really have a lot of volume, it looks kinda flat. Higher contrast should help that, also you might want to move that lightest shade inwards from the outline a bit. I don't think those white spots really need that brown outline; I think it would look better with a buffering shade instead.