I did a quick (messy) paintover to show that you can add more lights/shadows to push the forms and volume of the face. I would suggest to scale up the face UVs or scale up the image texture. You really need more pixels to work with, especially as a beginner. You could take a look at this paintover by DemonPrincess. It has…
Good work so far! I agree with the comment of her face being too narrow. I also think you could push the small detail in your diffuse (I have this issue too, so I understand). For example, I can't tell what kind of material the blue stuff on her armor is supposed to be. It seems kind of stone-y, but I'm not sure why she'd…