String Quartet No. 1 in Cm

This is a piece I have been working on for the past two months. It is the first movement of a string quartet. It will be performed at my school in December. This is the final week to work on it before I will distribute the parts to my performers and we rehearse at the end of November.

If anyone has any last minute comments or concerns regarding the score, i.e. notation, dynamics, score aesthetics, rhythm, in other words, small stuff, please let me know your thoughts.

Thank you. I appreciate the time of anyone who helps !

String Quartet No 1 Mvmt 1.mid

I like it quite a bit.  My only bit of feedback is that parts at times seem to drop in and out without a clear reason.  For example, measure 27, when the descending figure in the viola and second violin fails to resolve in the next measure (at least to my ears) and later in the work, parts just pop in for a couple measure then drop out. 

However, I really like the balance between the players, particularly the viola part which actually does a fair bit of heavy lifting in this movement which I'm sure your violist will appreciate.

I took the liberty of putting your midi file through garritan string soundfonts which aren't great but I thought made it sound a little better. 

Good ideas, going through each one here:
m. 3 - probably should resolve that instead of an add 2 chord.
m. 13 - Don't really get this measure still... without the fermata and the moving line, it could very well to the next section.
m. 26 - Should probably be a B in the cello, since it needs to follow convention.
m. 31 - and of 4 is awkward.
m. 34 - a GP or verbal directions is all that's needed, not a time change.
m. 45 - even though this is the home key, it felt like an awkward resolution, if not for the resolved feeling before with the enclosures. 
Generally, you can have some notes last longer and change homophonically; it sounds a little bit too horizontal to me right now. Guitar might be nice for it.