Nala the Lion King

I don't know why but her mouth's driving me crazy! I've tried to fix it multiple times and it always looks wonky! Maybe I'll try again later but yeah so the last picture I did was Simba so when I'm bored I've decided to do all the lions. This here's Nala (nooo really?! ) and I think I'm going to do Tojo or Malka next Please please PLEASE if anyone has any tips on shading I'm dying to hear them! I could really use some help!

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