I mostly lurk here, but thought I'd post some of my compositions I have been working on to get some feedback/critiques from you. I started playing around with composition and orchestration about a year ago, so I am still learning quite a bit.

Here are my compositions starting with some of my more recent tracks:
Grand Theme (http://www.eclecticvideo.com/Media/Music/GrandTheme.mp3)
Coldness (http://www.eclecticvideo.com/Media/Music/Coldness.mp3)
Abandoned Station (http://www.eclecticvideo.com/Media/Music/AbnStation.mp3)
Abandoned Station Battle (http://www.eclecticvideo.com/Media/Music/AbnStationBattle.mp3) (rough)

Older, finer-tuned tracks:
Battle Theme 1 (http://www.eclecticvideo.com/Media/Music/BattleTheme1.mp3)
Serenity (http://www.eclecticvideo.com/Media/Music/Serenity.mp3)
Sailing (http://www.eclecticvideo.com/Media/Music/Sailing.mp3)
Intense Battle (http://www.eclecticvideo.com/Media/Music/IntenseBattle.mp3)
Fanfare (http://www.eclecticvideo.com/Media/Music/Fanfare.mp3)

I definitely think my weak points are transitions and percussion, but hopefully I will improve on them with more practice and reading. I'm also learning more and more about orchestration techniques, so I realize most of my compositions lack a lot of dynamics and sound kind of thin sometimes. In any case, I appreciate all the comments/critiques you have for me. :)

Those were really interesting. However, I do think you have the same problem that I have, that is, finding a good melody.

In my opinion you are doing well, keep learning and growing =)

Serenity:
It feels soundtrack-y. The ostinato and the overly loud guitar is really the only tedious thing I find in this piece. Also, the mood was almost always the same throughout the piece, it got really tiring toward the end. I guess my approach to improve on this is trying to add more variety in melodic and colouristic elements.

Grand Theme:
Something is wrong with the harp... It sounded much more reverberated than the other instruments. There's also something I don't like when you introduced that bass figure in the lower strings and then the chromatic intervals... It just felt too grotesque for what you set up with. At 2:10, it felt too lost. Your orchestration made it fall apart, I would say. However, you restated your theme later. I guess like you said, the lack of dynamic made the piece sound wimpy than really 'grand'. Your introduction also felt too long and unclear. To some degree, a composer should organize their composition in a way where the audience can conceive it. Near the end, your cymbal motif felt tedious as it was just 'there' over and over again. Take out the timpani triplet in the end. It just felt too cliche and forced.

Listening to those two pieces, you're not a bad composer at all. I guess you just need to embellish your ideas so that they can present to the audience clearly and in a way where some people would call it 'memorable', or at least 'hummable'.