Looking at the photos, I'm convinced that you're fine. In fact I believe that you have some room to go wider.
From the photos I doubt that your 28mm tires are actually 28mm on those rims. Measure them, and if riding conditions warrant it, you might seek a slightly wider tire next time.
Note that tire width markings and specs need to be taken with more than a grain of salt. So one brands 32mm will be fine, another's 28mm may be wider.
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