That's good, but I'd suggest for you to download GIMP and download the G'MIC filters.
When you get Gimp, I'd suggest you use fuzzy brush (19) at about 22 pixels, be sure to zoom in at 400% so the picture you'll use will be blended in PERFECTLY.
Download textures, psds, pngs, and more at tumblr, or deviantArt. It'll help bring in more details and it also gives you the opportunity to experiment after you get used to using it.
Download some fonts, you can find some font packs with some commercial fonts that the person whoever made the font pack found a free download of.
I'd suggest you'd search up some tutorials, as it'll help you improve.
Hope that helps!