When should you work for free
A lengthy piece of reading regarding pricing, why working for free is bad 99% of the time, some economics 101 on the subjectivity of value, and why you should start charging for your services. Hopefully this will give you a better understanding of how transaction works and how you can better sell yourself.
https://www.cgarchitect.com/features/articles/2f82483e-when-should-you-work-for-free