Commissions?

To make some spare dough for myself, I wanna start doing commissions, but before I do, a couple things. First, what style? My default, cartoony style, or something else? If it's one of the ones I have posted, like the one from the Jake from Statefarm drawing, what should I improve? Finally, what would be an ideal payment app, because I think it would be PayPal. If its something different, I will take suggestions.