Alright, it says your photos are okay to edit, so I did. If you want me to remove it, just say the word, but I did it to illustrate my point.
1. For a beach portrait, choose a better background, I removed the garbage cans from the background
2. Get closer, your girlfriend is the subject. I cropped the photo
3. Again, your girlfriend is the subject, so I blurred the background to bring the attention to her. You can do this in the camera by either using the portrait setting, or manually lowering your f-stop. It takes some practice, so play around the house alittle with it and you'll figure it out rather quickly...
I did the best I could with what was in the photo. I'm just trying to show you the very basics of portrait photography and so far as a noob, this is what others have taught me... Have fun, take care, and keep practicing, that's how we learn...