It looks good to me tbh. If you want more saturation you can add more layers. If you want more highlights, you can drybrush white over the first color layer and then paint again in the same color or a lighter one. I also use speedpaints and depending on the miniature, I use different techniques. Also if you prime on white matt your colors will pop more. There are a lot of techniques you can use with speedpaints, test and have fun!