I could not locate any appraisers that live in Detroit but I did find three in Michigan who appraise art. They are all three certified.
Most appraisers are used to a bit of travel time. Alternatively, you could take your paintings to them.
I will attach an image for the contact information for two appraisers.
The third is Richard J Fedorowicz, W Bloomfield, MI,(###) ###-####
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