Some more details regarding complexity:

Fur patterns:
Rainbow fur: One or two sections, for example front legs, hair etc is fine. A complete mashup of rainbows all over will be charged.
Tattoos: In general I don't have a problem, multiple complex ones will cause me to charge you though.
Plates and scales: For scaly furs, this will only be in effect if you really have many I need to detail.
Feel free to ask me for a quote before you decide to order.

Accessories:
In general they are not a problem. Something like a shirt with a painted sunset on it, 300 piercings and the Taj Mahal on your leg warmers might make me add a dollar or two though.

Coloring: Most furries don't have a million different shades of coloring on their characters but this has been a time consumer for me before. Always feel free to ask for a quote before you order.

Extras:
Limbs:
Extra limbs as based off the average quad character. If you have a dragon with wings, you have already added your extra limbs, if you have a taur that counts as well.
You are allowed six limbs on a floof without charge.

Props:
You are allowed to give your chibi a prop, give your cat a ball of yarn, give your puppy a bone and so on. Complex props that may be charged include detailed jewelery, specific books or cd covers, dressing up of your character and so on.

I hope this has cleared it up a little for everyone, again, always feel free to ask for a quote of your character first. It just requires me to look at your refsheet :)

Enjoy!
SAI