I made this Pixel to practice my dithering skills. Unluckily i only know 2 types of dither as shown on here. Please help me get it up to standard so it will be accepted into the gallery.

well I wouldn't call it "trash", practice is practice and everyone needs it, so there's really no need to put it down like that,  but still, a dithering pattern is far from a completed art piece, so even if you get more patterns in this, I wouldn't suggest submitting this to the gallery just because it's not a creative/original piece.  Try to look up some tutorials on the site and then practice more with different shapes and forms, rather than just one plane.