No need to PROVE it's yours if it's yours! Only becomes an issue if it isn't yours and the REAL artist finds it! What I would spend some time on are the images that you did up[load, some blurry, some tiny, one not cropped right, etc. Here at FAA, there is no Quality Control UNTIL an image is sold and then the PRINTER determines if the quality is good enough to print. But by that time, too late for the buyer.
So take some time and re-visit your uploads and fix whatever needs to be fixed, before you upload more of the same kind of issues. Really want to ONLY u[pload quality images, right from the start!
Don't worry about that as they are appear to be yours. Are you wondering if a customer to FAA wants to know if yours is original or not but then again most that are here to purchase are buying a print or product with your images on them.
usually you have the raw files. you can register things in the copyright office as well. but that's expensive, i think. you'll have to reshoot that cardinal, they won't print it like that btw.
and you'll want a lot more keywords than one single word. no one will find you that way.
generally if someone steals your work you would forward them to this site in the DMCA showing them you uploaded it here first. i wouldn't worry about it though. just keep all your files in a safe place.
for example won't print and doubtful anyone would buy it. its totally out of focus.
i wouldn't mention it was made in highschool. but more so you need to scan this in. its never going to print here. the site has strict printing standards, the image should look the same as the item in your hand. same with the chicken. its too small and too soft to print. holding a sheet of paper in front of a camera set to the lowest settings won't help you sell. same with the squirrel. frankly they are all too small.
make sure your camera is set to the highest settings. its weird that one image is big, the orange one.
if it looks sharp then it should be fine. i'd say the orange one is fine size and sharpness wise. the rest are small.
your phone should be able to support larger images, just be sure the setting show the largest finest setting. right now its only large enough to make a small print.
the last one with the blue sky is nice sharpness wise but very small.
also i know it sounds like i'm hounding and attacking you, i'm not, its just that if it does sell, the site will only check the work at the time of purchase. and even if the buyer really wants it, if you can't fix it you can't sell it. they only give like 3 days to repair it. it makes the store look bad, annoys the buyer and its sad to lose a sale.
if the orange one also came from the phone, then it should be able to handle the large size.