Well everything is relative, it depends on the agency, but Goodgirls have a standard of 40 for CIM, 80 for Greek. Back before i remember sometimes CIM being just a 20, other times 50, and Greek was often 100, but lately i have seen 50 as well with some agencies...
When it comes to COF its rare i saw a definitive amount, but usually it compare to CIM... some ladies allows it if you shoot just on the cheeks or such, like not above the nose. Full Facials often result in cum in hair as well, so very few will be all willing for that.
As for Greek what do you mean partially? Just entering the hole but not doing it? I have no clue how the payment would work lol. As for rimming i have no idea.