In the movie "Big Fish", the main guy falls in love with this girl and finds out she likes daffodils. So he plants an entire field of daffodils for her. In the movie world, this is a sweet and honest gesture. In the real world, this would scare me and I'd cringe away from the guy.
If you want to be romantic, don't rely on movie lines. The girl will know it didn't come from you anyway. Rather than saying, "your eyes like stars", etc, simply hold her gaze for longer than usual and say, "I like your eyes."
I don't know the inner workings of Hindi, but having spoken Vietnamese to my boyfriend several times, I will say that it's important that you know exactly how you're addressing your significant other in that language. In some languages (like Vietnamese), there are many forms of "you", ranging from family, friends, lovers, teachers, children, etc, and even then, each of those categories may have several sub-categories. Once, I used "ahn" form of "you" on my boyfriend because I used an internet translator, and it ended up being way too intimate. Still, he appreciated it all the same...