He denied payment

It's kinda impolite to ask people "hey do you want me to pay you". I would refuse that too. If my work is appreciated, then the community will approve it through an official vote, I don't want to rely on someone else's kindness.

Regarding Josh's work, his donation address is visible to anyone in his posts (@joshoeah). Other than that, the other polite thing to do is to propose an "official payment" i.e. from the Foundation and vote for it. My Joint Marketing Initiative is seeking to establish such a fund, to pay professional designers for their professional work.