I've been a professional artist for many years, and I know EXACTLY how you feel! Many of my "children" have gone out to make their way in the world and it's a very scary thing for "Mom"!
It's a little like walking down main street in your long johns (with the flap down) and feeling a draft! Talk about "exposed"!!!
But no matter what the outcome, it's so VERY WELL DONE to send it anyway. Just wanted to acknowledge you for your courage as well as your creativity!
Best of luck and keep creating - and hyperventilating when you send them out!