As well as the colours I can't see anything in this other than a collage of built in photo shop effects, you should check out the work of guys like kenet, visualice, alien, irokos, mx, can, etc etc to get some ideas of how colours and design can be beautiful.
There are some notable artists on this forum too, generally what you find with them is that they spend a long time (many weeks or even months sometimes) on one piece.
Although I am reknowned for having no colour sense at all when I am making demos, believe it or not I actually started life as a graphics artist on the Amiga, and back then I used Deluxe Paint, pixel pushing basically with a limited palette (usually 16 or 32 colours for pics and logos, 8 or less for fonts).
I was in groups such as paintbox with saint and lils of the silents, wizzcat and several others and had my art used in lots of scene stuff, I placed 4th in the gfx comp at the digital main event 1991 (I was beaten to 3rd by lynx of rebels, I actually took his pic along to the party for him because he was a mate, silly me..).. I placed in a few other gfx comps too so I do know vaguely what I am talking about.
My advice is to decide what you want to do... Are you a coder or an artist?
Then practice...
Practice and practice until you get good at it.
When guys give you constructive feedback, don't dismiss it.
When you post your picture or code here you will get critique, it's a good thing to follow peoples advice, especially when thay are all saying the same thing.
Another thing about pixel art... Even in my most productive days on the Amiga, I never pumped out the work at anything like the rate you are doing.. It's better to spend a year on something that is amazing than make 100 mediocre - average pieces in the same time frame.