I think its good. You already have a unique and identifiable style, which is great.
The line work may benefit with being thinned some, or perhaps some more 'hard'
variation. I quite like the nose/mouth area, good use of thin and thick lines.
I'd say i'm not a fan of Twi's hair shading, partially cause it's only on the hair.
That said I don't think that kind of shading would best suit your style I honestly
think flat color would look just fine; possibly cel shading. But as it is, I wouldn't
even call that a complaint, barely a nit-pick. Just refine what you already got.
Also, as previously mentioned, the horn. But honestly I like it. Occasionally
oversize body parts are quite humorous. Same goes for undersized bits XD
Of course, and as it always is with art, my opinions are massively subjective.