My take on what a real Goron might look like if you came across one. If you haven't played any of the Zelda games, Gorons are a humanoid race of rock people inhabiting Hyrule. They eat rocks and typically dwell in caves and mountain ranges. Despite their hulking appearance, Gorons are a peaceful species.
(All done in Photoshop)
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It doesn't turn into a perfect ball but it can definitely scrunch things up. At the very least, maybe it can charge it's enemies and summer-salt crashing into things with its back.
the texture work is incredibly well done!