Mahlon

Good job on your piano concerto, you have obviously given much time and effort to this piece. Assuming that you are a beginniner composer by the issues already brought up here, the best suggestion I can give you is to work on SMALL pieces, notice that I capitlized small =), everyone has there moments of glory, I must admit I tried writing a piano concerto before I could even read alto clef.. which is ok I guess, but look what I'm saying here is that there is no shame in starting out small. My favorite composer of all J.S. Bach, was the master of writing on a small and large scale. ALthough his WTC for piano can be seen as a HUGE work if looked at entirely, the individual fugues and preludes are all relatively small pieces. I suggest you look at those, and try writing much shorter pieces before you delve into large orchestral writing. How about a nice solo piano prelude, or a piano trio, or a violin sonata, or anything chamber, just please, take it from me, I myself have been working on Small scale works and it has really helped to improve my writing, you don't have to do it of course, but I hope you do.
Good job nonetheless, although I must say I think you should put down this work for some time, try to compose a short piece with a simple form, like a set of variations for example, and then come back to it once you have more experience with writing music.
Good luck, and happy new year!