It's a tough question, because to discuss exact rates together could be
perceived as colluding set prices, which could be unethical and illegal.
That said, thinking of it by the hourly rate plus overhead is a great way
to gage a price.  If you're very slow because a lack of skill, but you can
reach a professional level eventually, then think of it as training/school.

There is also this:

On Thu, Mar 19, 2015 at 7:54 PM, Emma Scheltema <[log in to unmask]>

> Hi everyone,
> I wonder if anyone would have any suggestions for resources for pricing
> for commissioned scientific illustrations? I am a beginning science
> illustrator (I have no formal qualifications in this area, besides my
> degree in science and having done Lana Johnsons Entomological Illustration
> class), so would obviously expect a lower rate than someone with lots of
> experience. The thing is I really have no idea what to charge, besides
> having read not to use an hourly rate (at this stage no doubt much longer
> than an experienced pro anyway). I have been asked to do some illustrations
> for a professor at my university and am at a loss for what to sort of fee
> would be reasonable.
>  I have heard of the graphic artists guild handbook for pricing and wonder
> if that would also be suitable for scientific illustrators? The only other
> thing is that I am in New Zealand and I'm guessing that rates here would be
> different again than they are in the US. Do any illustrators from
> 'down-under' use these guidelines at all?
> Basically I wonder if any of you experienced illustrators would be able to
> point me in the direction of any other resources relating to pricing- I
> would greatly appreciate it!
> Thanks in advance!
> Emma
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