Our four horses are QH, but One I believe is appendix, and they all have very different heads.
Cracker is a dopey gelding that has a roman nose and it fits him, it is masculine on him and fits his body type.
Gracie, she is a halter type with fine legs, but sometimes when you just look at her head you would think she has some Arabian. Her forhead dishes slightly and has big nostrils.
Stilts has a typical cutting horse type head, a little longer with a fine muzzle and a big eye.
Then the Appendix, Zorro, has a big TB type head, not roman nose but straight.
Point being, breeds usually have ideal conformation characteristics, but it doesn't always apply obviously.
I DON'T LEAD 'EM AND FEED 'EM, I RIDE 'EM AND SLIDE 'EM.