It's lovely, both the applique and quilting. A really fine job. As to price. You probably won't get what it's worth, even at $1200. With such labor intensive projects that is usually the case. I like $1200. You can always negotiate down, but can't go up. Perhaps it's better to start at $1500.
However, ASK the buyer what they are ready to pay, before you set a price. You may be surprised. My attorney DH always did this and usually got a high number, as people are not willing to low ball you.
Good luck
Sandy