Oh yes that would be cool! Just remember that if you want to put horns on your Finx you need to choose a at least one mammal with them (like caprines or cervidae) for the Hybrid! 

(see traits or ask me again if you have any doubts) 

And you only need to have at leat one of the default forms (which are feral or anthro) for the ref to be approved so yes, draw them feral and youll be good uvu

and yeah you can do traditional no problem! Just try to make the photo as clear as possible

(I highly recommed scanning it)