I love the use of color here. Nice patterns and details and textures. I love the way it captures your attention with vibrant bright colors. So this was a nice charterer you have here, I like the armor and the background the most but I would suggest some deeper use of effects of glows and lighting. I would even add a border to this one for sure. The main issue tho here, is that your lines are very very pixelate and they need to be smoothed out, unless you want this effect, but it tends to make your artwork seem sloppy. Good work tho and good eye for color.
~~THINGS TO IMPROVE ON~~
Just fix your issue with pixelated lines and more effects inside this.