Answers
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Left: An image of Europa taken by NASA’s Galileo spacecraft
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Right: The end of a rusted 500 gallon propane tank belonging to my friend and photographed by me
Left: An image of Europa taken by NASA’s Galileo spacecraft
Right: The end of a rusted 500 gallon propane tank belonging to my friend and photographed by me
spoiler
You’re warm, but the shadows on these objects are natural because they’re both (hemi)spherical. I just used the curves tool to deepen the dark tones on one of them to make the shadow more pronounced.