flutterbat painting practice

I need some help with this, im trying to learn how to paint in a more detailed style. This is how far i've been able to take it, but i need to put much more detail into it if i want to make it look good. Please comment, how can i take it one or more levels further than this? how can i add details like fur and textures that look appropriate? Also, are there any photoshop/SAI videos you would recommend watching for this kind of practice?