Horrid attempt at shading

Okay okay, this is mostly posted for Elli, who is helping me learn to shade and light a picture, but anyone can comment if they have any advice...

This is what I titled [Shantae] Ali~ This is my OC Alice trying to be Shantae, the half-genie hero~ I like her so I was going to make Alice dress like her, but the red didn't look right on her to me, so it turned blue. And the outfit is different too, I just didn't want to steal the full outfit... besides this outfit looks more like Shantae's special blue outfit, though still not fully ANYWAY! I digress, I still like this picture mostly... But I still feel I'm not very good at shading... any hints and tips would be very appreciated.
And thanks again Elli for trying to teach me! I'll get it someday!

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