If you've been eagle-eyed, you may have noticed that I've been hiding messages in my recent drawings (in each TFTuesday picture over the last 12 weeks!)
This has been my attempt at a puzzle! Free TF* to the first to solve.

Find each of those 8 letters by solving each individual picture's puzzle. Put each 8 letter solution in the correct slot above. Combine all together for the last puzzle. The answer to that puzzle will be the final answer.
I've solved the first one for you so that you get an idea of how it works.
(Also, threw in a curveball in there. Have fun!)

I hope I haven't made any mistakes, but if I do, I'll fix it and add a comment here about what's changed.
Edits:
1. If you think you have a solution for each picture, but can’t get the solution to the final puzzle, you might have one or more wrong. DM me to check.
2. Changed the goat one. It wasn't correct. It should be right now.
3. For the monkey one, use the standard i=j (see wiki for the cipher)
4. For the Pig picture, typically i = j, use J in your answer.
5. Someone solved it!!! I'll post the solutions later so you can continue to solve it.

Puzzles:
https://www.furaffinity.net/view/45760077/ <-- Example from above
https://www.furaffinity.net/view/45874080/
https://www.furaffinity.net/view/45980175/
https://www.furaffinity.net/view/46088202/
https://www.furaffinity.net/view/46187848/
https://www.furaffinity.net/view/46278778/
https://www.furaffinity.net/view/46509475/
https://www.furaffinity.net/view/46517690/
https://www.furaffinity.net/view/46758088/
https://www.furaffinity.net/view/46758200/
https://www.furaffinity.net/view/46758299/
https://www.furaffinity.net/view/46856005/

* a TF within my limits. Will be comparable to what's seen in this series. Also I'm only comfortable with drawing men. Will not draw spider or certain bug TFs, or some kinks or whatnot (such as diaper/scat/etc).