I'm not gonna lie, these are pretty bad. They just aren't appealing to the eyes at all, really. Look up some tutorials. Since you already seem to know how to use photo editing programs, you should improve in no time.
Nice job Singstar. ^^ Let's see if you can now make much more thrilling effects now. Like in the third, we could add some of those spells trailing around Harry. The first, you could add some more romantic items in and the second you could have a fire background. Good luck! *purrs*