I created my own portrait and placed it into the game successfully. However Penny`s size in the orginal photo seems too large,do you know if I can make Penny becomes smaller without change the pixel (256*256 and 512*512)in photshop?

When I change the document size, image pixel change automatically...
Or must I choose anther photo with Penny`s head is smaller? But I love the current portrait, it s really cool..
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