Is this bad?

I doubt that the uploaded (i.e., "published") photos would raise objections from the store owner unless they contained proprietary information, such as branding or marketing design. Without this, it would only be a matter of privacy customs and practices in your community. Your age (minor, 14) in this or any other circumstance, would only be a factor if you were charged with a criminal offense. Of course, I'm not counting the "feedback" you'll get from your parent or legal guardian once they become aware of the (possible) controversy arising from your actions . . .