These are merely animated singular icons to customize your DeviantART identity with.
Linked DeviantART Avatars
Linked DeviantART Icons are where the icons are animated together and one person uses one icon, and another person uses the other, then when you put the two next to eachother, using the format below, they display an image.
:icon Insert Username Here::icon Insert Other Username Here:
Journal Dolls are small animated Dolls that you can put on your page or Journal etc to customize it to your liking.
Pixel Dolls are similar to Journal Dolls in the sense that you can use them to customize your DeviantART page or Journals etc, except, they aren't animated and therefore are much more detailed.
Full Body Drawings are pretty much self explanatory, they're full body detailed drawings of a character of your choosing. If purchased you will receive a neat, shaded, detailed, fullbody drawing of a character you choose.
Full Detailed Reference Sheet
These reference sheets go much more in depth then the other simplified option does, they also can include various outfits/forms of the characters.
Simple Reference Sheet
The simple reference sheet is just much smaller and much less complex then the full detailed option. They are not shaded and the Template for the information to be included on the reference sheet will be shown below: