might I suggest finding a color scheme to stick with?
it almost looks like you just used whatever you randomly selected, as far as colors go.
the characters also seem just randomly spaced around the screen, try making them bigger, and perhaps overlapping, or all being in that dark area of the screen.
next, perhaps the title screen should have something to do with the name of the game, or perhaps a location, or something to do with the story, other than spoilers of the main villians?
Lastly, I agree with Holk, an actual logo should take the center of the screen.
in the end it really comes down to what you think looks good. you don't need to be terribly good at Photoshop to make a halfway decent title screen, and it looks like this one is on its way there.