I did a search, and couldn't find a thread in regard to this. Apologies if my search-fu is weak.
Please do not tie animal ears to tails. There are plenty of Comic characters that have animal ears (real and costume) and no tails.
I am sure there are many people that would like quite a number of specific types of ears. My personal request would be ears that look similar to this:
Please allow animal ears with no human ears.
As mentioned above, please do not link tails and ears.
Also please allow both tails and belts.
Tails should be an extension of the spine, and not at a 90 degree angle to the spine. I know something correct won't look right on an upright model. However, something less than 90 degrees should be possible.
Feral face -
I would love to have a face that isn't an animal head stuck on a human body. Here are some examples:
Basically a bestial face, with fangs.