The sprites you do are fine! But something little. Try to do bigger pixel art, it will be difficult and will take a lot of time, but at the end you will feel good! Your sprites have some fails, but not a lot. For example, you could add more lights, shadow effects on them and also darker outs (with black color). Like your last fake, this one it's very great! It hasn't got fails. Only you could improve the eyes, actually it looks like Stitch. xD But it isn't a problem.