You've asked for feedback but without saying what you're aiming for - what is the purpose of the music?
But on a purely theoretical note here's my feedback
First piece:
Choice of sounds is excellent
0:00-0:14 is a great intro - sets the scene nicely
A small technical point about the melody - at 0:14 ish the viola/vln sound goes back to the tonic note, I would choose something different at that point like a tone lower as this will create more sense of the melody going somewhere
At 0:14 the other instruments come in and it's suddenly quite confusing to listen to. I would go for a less busy sound overall - by getting the staccato strings to play in the same rhythm as the harp or vice versa. Then you could use the more complex texture later if you want and it's a free variation that has cost you zero effort.
From 0:51 to the end is a fantastic sound bed.
Piece 2:
Nice variety of instruments and textures with lots of little 'bits' to listen to. The problem for me is that there is no 'main' melody to get stuck into.
In general:
I would say you have some really creative ideas with texture and the interactions between instruments, and your feel for harmony is good with some interesting moments. You need to work on writing melodies that are concise and singable - can you step away from your composition and still sing/hum the main melody? Would someone who's only heard it once? Once you've got this melody, how can you develop it to keep the overall feel but make it somehow 'new'?
Again, this is without knowing your specific aim - I'm asuming you want to write music that is memorable and engaging. Something my composition teacher at school used to always say was 'Repetition, contrast and singability' and it's what I now say to my students, unless they're writing avant-garde music!