Thanks!
2-3 drawings cost 40$, and many commissions are more likely to be no higher than 50$. It all depends on how many details there are in the character design and what kind of pose. If it's a transformer with shining galactic armor, put in a dynamic pose, with perspective and a camera, of course it will cost 70$.
You can also negotiate a price and discount with me, if you want from me arts.