I think it is allowed. Otherwise they wouldn't allow: photoshop, change in color, etc. Because it's "altering" the photograph
and so is drawing. You're taking a picture (real or in mind) and altering it, on paper.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.