I know, like me so many of you have problems and frustrations while submitting your cards at GCU.It took me a while to learn the rules, So I decided to share it with you, so you don't have to go through major pain of "rejection" and approval process.See below
this is my shop
1.see the detailed titles , they want all titles to be detailed,like if your card has a poinsettia, a ribbon and a gift box, your title should be "poinsettias red ribbon and gift box Christmas card" your tag should also include these 3 words among others.
2.image size is 2100x1500 or vice veras, jpeg format
3.you cannot add text to front of card, so make your image with the text
4.If you card suppose has a red ornament and snowflakes, tag them "Christmas,red ornament,snowflakes...that's it, no extra tags like 25r dec,major holidays,fun stuff...e.t.c. like we do at zazzle, just relevant tags
5.categorize your cad very accurate like if front of your card says "happy holidays" then it should be place in Christmas--->happy holidays.They have a category for everything ,so look and search properly before submitting
6.if suppose you are making a mothers day card, and you have no text at front, then it "should" say "mother's day" in the front,
7. Good luck!