Some good gifts that your girlfriend may like are a necklace, ring, I Phone, Teddy Bear, Dress if she wears one etc.
A photo tower that has your photo as well as hers in the picture and photo tower or just a picture frame with a picture of yourself and her.
Another good gift you can get your girlfriend is a locket with your and her picture or at least your picture in it and have the locket personalized with her name and your love for her.
A pillow known as a photo pillow where you have the photo of yourself and her put onto the pillow and have the photo pillow personalized.
That is a list of some gifts I would love if my boyfriend gave them to me but there's also other gifts that you could get your girlfriend and even a box of chocolates is a great gift.