Hi Gerald,
First of all, your work is truly exceptional, and your experience and command of the medium shine through. Congrats! I wish I had some discretionary funds to buy a few.
I am not qualified nor knowledgeable enough to speak to sales trends for W/C works, originals or prints. I would like to make one comment, however. That is, you may want to rethink the color scheme and format of your website. The black background is too stark and washes out the impact of the watercolor. You want a site visitor to experience high-end watercolors and the more polished and professional your site the better. Of course, a website nowadays must be fully responsive to mobile devices. When someone lands on the homepage of your site, you want a "wow" factor. Also, you may want to entertain a presence on various social media for posting purposes, and perhaps drop your FAA shop into your website.
Good luck to you... you have created a stellar body of work.