I disagree bro...it all depends on your delivery. If you are acting super serious and stalker like, then yeah, the friendship is tenuous. But if you say something casually, the friendship should be fine. Who doesn't like a compliement? Just give a casual compliement, and step back...see if you get any feedback. Judge for yourself, if you like the results, throw another compliement at her a few days later. By then you should have a good idea.