Hi there, we know you've credited the artists you took the pictures from, and that's fine for the second Instagram account, but unless you can provide proof that you have permission from the first Instagram account from both the artist and the person who commissioned the works provided we'll have to disqualify your project.
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This is incorrect, those images were posted in public domain, but Instagram EULA does not allow use of other people's posted content freely. It is allowed under exceptions or limitations to copyright and related rights under applicable law, as in the people who have posted them are inherently the copyright owners. It is copyright infringement to copy, distribute, or create new works based on their works without permission from them, which the second Instagram has explicitly allowed but the first did not.