It's nice getting to hear one of your own compositions on here! I might argue that NG isn't the best place for contemporary classical stuff, because people here tend to shy away from stranger modern stuff like this (A comment about jazz having lots of wrong notes comes to mind lol). On the other hand, if you'd like to post 'sketchbook' kind of stuff here, then by all means go ahead! Just don't necessarily expect most people to know what's going on compositionally haha.
As for the piece itself, nice job! Some of the combinations of sounds were able to get were very nice. Especially the combinations of the viola pizz. with the plucked harp, they made for a nice background/accompanimental element against the flute. The main bit of critique I could offer would be to make the distinctions between the 'violent' sections and the calming ones more distinct. The opening REALLY caught my attention with the intense dissonance and sfz attack. Some of the subsequent sections still had a bit of that 'violence' but it felt like it kept getting weaker each time until it the two starting blending together a bit too much. I think you could have gone even more intensely with the 'violent' sections later on to really create contrast.
Overall, really beautiful piece! Always enjoy hearing your music! :D