Hi ! i really liked all your tracks, especially th e2nd one that fits a more serious and ambient vibe.
I think that you could try to play more with the velocity and volume of the notes for example the harp in your third track is repetitive ( which is good ) but with a little more variations in the volume, expression and stuff it could give it an other sound. ( kinda same with the piano on the first one )
Hope i could help you with this feedback :) have a great day !