I'll try to not make that too expencive cause they're not that good and i'm limited with 3D models so...
I would say that:
3D pony: Around 20-50 (depend on the OC) and the 3D presentation is free
Just a 3D picture request: still around: 20-50
And just a fan button: free (i still not know if i should make them payable)
Exemple:
Ect...
And for many info about all the mane i have there is a picture that can show:
+ <====This mane