Hello William,
I thiour work is absolutely great. I couldn't imagine that anyone would choose not to purchase your work because "they thought you were fraudulant". Your work is good enoug that, as I see it, it is a non factor.
Just a suggestion...have you checked with public organizations that can allow you to put a their logo.
Then the rest is simply getting exposure. Targeting your niche market will take spacific and thought out marketing stratigies, ie...social media, like an "orange soda" type approach. Good Luck!!