Edit I chose more saturated colors and used hue shifting to make the palette more interesting (yellow highlights, red shadows). Perhaps most importantly, I've eliminated the dithering (which is typically unnecessary on small pieces, especially those in which you're trying to convey a smooth texture) and I upped the contrast considerably. The green background creates a triadic color harmony, so I thought it a good background color to use, but that change is of lesser importance.
Try giving more contrast with colors. Give it a nice bright orange to start, then highlight with a couple yellowish oranges, and shade with some reddish oranges. And use a lot more shadows to give it more depth. I agree with Met, no need to dither. If you want an example I could try. Else, just see if you can apply the things i listed.
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I chose more saturated colors and used hue shifting to make the palette more interesting (yellow highlights, red shadows). Perhaps most importantly, I've eliminated the dithering (which is typically unnecessary on small pieces, especially those in which you're trying to convey a smooth texture) and I upped the contrast considerably. The green background creates a triadic color harmony, so I thought it a good background color to use, but that change is of lesser importance.