Tulips are tough. Whit ones are even tougher. My first suggestion would be to have the flowers backlit against a window, or something light, delicate, and out of focus. That way the picture will have some depth. If you use natural light, a white bounce card may be all that is required for fill. Or you can use strobe. I don't think a black background works--it really deadens the subject. Maybe subtle out-of-focus greenery? Finally, the tulip, or any flower for that matter, should be fresh and exhibit not a single imperfection (or at least one that isn't able to be fixed in post). I once went through over 100 fresh flowers until I found the one that looked perfect to the camera. If you are just starting out with botanicals, I suggest trying lilies first.
