I agree. You start making pictures like this bigger and with some more practice and bam, you'll have some images in the permant galleries. Keep up the good work!
By using just two colour and varing tones, it's a good piece of work, but I too agree, you could these days create a larger picture, giving you a wider and better scope of artistship.
You are right it looks awesome and it's small what program are you working with I know for sure that if you work with Photoshop you can change the Image size but I am sure you know how to do that on your program just put it on 1600 by 1200 pixels and it's a perfect size
Keep up the good work