I have been working on my graphics skills for many years and as much as I am not able to create amazing graphics, I am able to create some basic ones that have helped some people.
The most I have been paid for my graphics is £10 but I know with more practice and getting better, that will increase over time.
I don't collect large sum from people that I do some designing for. I can just collect a little money for the person to know that it's not a free product.
The largest sum that I have collected so far was from a company that needed a banner for their conference.