I've said this before on another forum: some people just cannot make a rose (me included). No matter how hard I try and how many different types of buttercream I use (I've tried everything: thin, medium, thick, colder, more shortening, less shortening, more butter, less butter, more sugar, less sugar, water, milk, no liquid--I swear! I do not lie) and I cannot make a rose that looks anything like it's supposed to. It's a skill many people have, but some of us don't.
I defy anyone in this area (northern NJ/NYC) to teach me to make a decent rose. I will personally drive to where you are and you can teach me!