First off, etsy requires you to use "team" in your tags so please make sure your tags say "t2t team". It also makes it easier to find everyone for picking treasuries if everyone has the same tag.
And let's get those tags added asap. We still have some of you who have not added them yet.
The first picture you add to a product is the most important one. It is the one Etsy uses and it will be in any treasury or showcase you are in. Etsy squares that picture and if you will notice a lot of the time heads will be cut off of dolls or you will see the middle of something and can't even tell what it is.
Save the full view of your item for the second picture and crop that first picture so that your doll's face or whatever the important part of your picture that will distinguish what it is will be seen in that square. For example, on a purse or tote, forget about showing the straps and crop your photo so you see only the bag.
If you need a photo retouching program, Irfanview is a good free one.