Greetings from Sunny California,
Not exactly sure what you are trying to do? Are you trying to "ADD 2nd item" into the same ONE LISTING? If yes, you would have to create brand new listing (must be blank page) and click on CREATE VARIATION (you can put many different variations in ONE LISTING). Do NOT use "sell similar or copy old listing" (page must be "blank").
Your "owl artwork" is really beautiful. Happy Selling and good luck to you.
