Interesting stuff Glennbo!
Cool arrangement. REminds my a LOT of music from 90's JRPG games.
As far as improvements, I think the timing of things overall could be a bit tighter in some areas, generally it's okay though.
The sounds themselves in MY mind are more reminiscent of PlayStation-area role playing games like I said above, rather than necessarily being a "realistic" representation of the 'proper' classical instruments. It could do some good to learn for each of the instrument groups their tendencies for how they're arranged and how they sound when they do certain things just to get a feel for making them sound more realistically-performed. Something I'm working on for my strings and especially my MIDI-woodwinds.
Keep on truckin'!
p.s.
Your tune "Why Not" is killer! Like the drums and saxes+keys! I kinda dig your jazz/fusion/rock stuff too.. sounds a bit like They Might Be Giants :)