What do you think is wrong with them? They look great to me.

i'm just trying find head that will best fit for Tiana

hmm, if I may offer my opinion on these; overall I like three but I also like elements of the others.

I like the hair on 2, 3, and 6 especially 2 and 6 though 3's feels the most natural.
The sweep of the neck in 1 and 3 look good and the most natural.
I like the shape of the snout in 2 and 6 especially with how the accentuate the points in her lip though I like 4 for the shape of the lip.
I like the eyes on 3 but the eye shapes on 4 and 6 though I also not really feeling the extra box around the eyes on any of them.
3 and 4 I like the most for her ears and spikes as they look natural and also help define them best.

hope this helps