While I can't speak to the previews you may have, the initial image you posted could use some work. It has glaring pixel artifacts and the lack of blending around the subtitle "A Hero's Destiny" seems kind of sloppy; e.g., if you made that in MSPaint you would have been able to have it transparently placed to where it wouldn't look like it was placed in a rectangular box like that.
Otherwise, welcome to the forums. I saw in your user title description that you are into Game Maker. There are people in the Coding boards who can help you with that if you need it. Oh, though, are you making the project in LTTP, Minish Cap, or some other style? There are a lot of graphical resources too here which may assist you in aspects of your project creation.