Dude, your work is worth more than 40 measly points.
$1.00 USD = 80
So basically 40 points are 50 cents. I don't know how long it takes you to finish a drawing but I'm pretty sure that it's worth more than that. Don't let others take advantage of you.
If you want to get paid in points then just post your info here. If you want to get actual money, you need to post it on the Job Services forum. Or you can always advertise both in your journal.