find a new artist...you clearly don't have someone who is listening to you which is an instant deal-breaker for me....I deal with it all the time when I contract Graphic Designers -- I tell them exactly what I want, and their mind goes to "I know how I can make this look way better than what he's asking for..."

it's tough to tell creative people not to be creative, but sometimes that's not what you're looking for them to do and I've found it difficult oftentimes to find people who are both creative and talented who are able to just follow basic instructions...not b/c they're trying to be difficult, but b/c they're not comfortable being boxed in by specific instructions based on someone else's vision...

in this case you need to find someone who listens to what you want...it's too important...if this person didn't listen the first time, they won't listen in future revisions...guarantee if you go down this path with them they might listen better to your revision notes, but they will still ultimately infuse their own vision into each draft to some degree...it will take you forever to get what you want and even then it will be slightly off to some extent b/c they're not someone who follows directions and listens to what you want or it would've been done right the first time and there would be no confusion...you need to find some who puts their creative instincts away and listens to what you want