from what ive seen they are just single character pin ups :0
generally staying in a cell to soft shading style and no painting

I think Iron Artists to my knowledge are simply a group of 10-25 commissions that are all the same theme or style

example of mine:

http://www.furaffinity.net/gallery/...../Iron-Artist-1

I have noticed that a lot of artist do like sketches or busts and offer a little deal so they are a bit cheaper than their normal prices OR they are something that can't be normally commissioned by the artist.

Hope that helps! ^.^

WikiFur defines it as: "a non-standard personal challenge for some graphic artists. It usually includes producing a greater than usual quantity of images over pre-defined period of time.
The most common challenge are 100 images drawn over a period of about three months, meaning one picture per day at least.
Based upon this premise every artist varies this challenge. Some do commissions (which are usually inexpensive sketches) while others stick to a list of themes or a predefined set of characters."

Doing the Iron Artist challenge isn't for everybody, Got to have lots of time and dedication for it. Some people will get their jimmies rustled if they don't get their IA commission done in time even if you've had a bad day or don't want to do it that day. (which is to be expected by any artist to have a bad/impatient client)

Hope this helps, if you plan to do this in the future I'd love to take a slot <3

to my understanding " iron artist " is a challenge where the artist needs to draw a very large quantity of drawings over a set period of time (usually either 3 months, half a year or a whole year- the amount of drawing ranges between 25-100 typically)
the drawings are usually of a specific type like stated above, like headshots, busts, chibis, etc, usually with simple coloring due to them being done on a multiple-every-day basis
the details such as time and amount and what you draw/how changes from artist to artist according to their abilities, time, etc
sometimes people do the challenge on a commission base, and in turn offer relatively cheap commissions in order to get a large quantity of them to be done due to the challange's nature
hmm
I think that's all I know of it!

Most "Iron artists" Things i have participated in have been sorta like the artist takes as many pics as they feel comfortable with for a set price then they strive to finish them all by a certain due date they set. usually a month or two. And usually they do a theme to go with it as a way to narrow down the pics variety a bit.

Thanks everyone! Might be doing one soon-ish!