Last week I was searching thru Google for articles on taking good photos, etc. I found a website that has some good info ... Ruby Plaza. It was not hidden, but I had not noticed it before. On Ruby Plaza, click on "Sell", then FAQ Knowledge Base, then "Pictures", and the last link says "Do you have info on taking great photos?" Click there and a group of articles will come up. All are written by RL sellers, and have some good info. These are several years old so do not have info on the new square thumbnail, but will give you some good pointers on photographing different things.
On Ruby Lane, the blog articles have some good info on taking good photos, but it is not easy to find the blog. On RL, go to site map at the bottom of the page, click on "Relax", then click on "The Blog". In their search box, I typed in "taking good photos", and many articles came up, all written by RL sellers. Didn't have time to read all of them, but those I read were very interesting and informative.
I am always trying to learn more about selling and presenting good pictures, and every little bit helps. Hope this will be helpful to you, Linda