I would be curious to see the artist's portfolio because if she could really make 4 flowers look realistic with the amount of color/detail they deserve then I could see $700 ... but if they are cartoonish and not shaded worth a crap or look like flash, then that is ridiculously high. I would also think something more like $300 would be more suitable given what you've described. But if it is like Kat Von D quality then yeah I could see $700 lol! I think Kat Von D is $1000 just to sit in her chair and get a very small portrait done.
You could rough sketch / paste together images in the way you want them and take it to several places to get prices to get an idea of really what the right price for something like that in your area is. It is such a regional thing!
My eyeliner was RIDICULOUS ... but well worth every $1 for something around my eyes.
I went to the Kat Von D of cosmetic tatoo artists, she has done lots of celebrities and is the regular CNN/newsnetwork artist ... but I don't regret what I spent one bit after I've seen the crap eyeliner jobs people get at salons.