Good but needs improvement.
This is a good idea and can be much improved. Rather than august calm I think this would do much better as a travelling song, think milkman dan Time, and Edgen Crossing time.
My advice is to bring in drums at about 1:06, continue to carry on the string build till about 1:10 then pull out a long call on the brass while carrying the tune with a few flutes up an octave, hopefully creating a harmony between the high flutes and the low brass.
The drums can go something like this in the beggining - dom dom dadun dadun (lower) dadun (higher) dom... dom... dudundun cymbal crash dom dom dom domdom domdom domdom then backing dadundun dundundun.... you get the picture hopefully. Make them echo a bit as if in a large hall.
Perhaps vocals? If you don't have decent vocals, don't try, otherwise they would do really nicely.
Other than that I can only say play from the heart, put feeling into it, and remember to weave each part of the song around its respecitve parts, listen to liberi lunerum to see what I mean.