I had my eye brows done, I loved them, it's the only time I've ever had an arch to my brows and if money allowed I would have it done again in a heart beat.
I have seen some real night mare brows, both on the internet and from clients who have come to me for other treatments.
So, what to look for, an artist who mimics natural hair, you will look very strange with a block of colour or a single line, I know I've seen both!
But an artist who uses her gun to place fine short lines, just like brow hair will be able to give you amazing brows.
When looking you want to see the artists work, not generic photo's from the suppliers gallery. You want to see testimonials and you want to be able to contact passed clients to ask them how they felt about the whole experience, just the same as getting a builder in
Don't go cheap, there is a reason it costs what it does, it's good training, quality products and experience.
Sorry I can't give you a link, the lady who did mine no longer does them, she makes more money as a tattoo artist down here in Corby.
hth