I think, depending on the country, you should charge differently, they are not the same $ 20 in the United States as in Chile or Colombia. For example, in Colombia you earn around $ 15 a day and if the work lasts more than a day, you do nothing, if you are from the United States, it worsens because the work day is more expensive, this explains why there are artists who do not accept commissions of $ 5 and if they do it it is for drawing; Now there are many clients who already have their artists and the chances are that if you offers do not give you the job, there are also those who have already pointed to someone (in light blue) and you as an artist can respect that and do not offer.