The color looks good to me! But, anyway, I have this feeling you use black /gray for shading. It's ok, but I find it boring. You should try using purple or brown on a multiply/shade layer, it will make it look more interesting! (I think, I'm not an expert)
Also, you should be aware of the color theory. This can be used when you're designing your character's color palette, but also at shading and making lights! For example, if you use cold colors for the shades (like purple. Sorry, I love purple for shading), you must use something like yellow or light orange for the highlights!
And then, you can really mess up your colours as I do hahaha