The viewing space without clicking on "open full image" has a set width that is the same for both galleries. Images are reduced to that. Depending on the ratio of the image, the height of course with vary which might be making it look like images are smaller. If you're referring to the full image, that depends on the artist and the size they make their images.

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Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
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I use Poser 13 and win 10