Whichever photo/pic/icon/banner etc you place first in your post will be the one shown as your main thumbnail on Steemit, so choose your first photo wisely as this could make the a difference between someone clicking on your post or not.
As far as this post I would personally place the pic below first as I feel it best represents my post and will look interesting/stand out as a thumbnail.
I wouldn't choose the one below first as I feel it doesn't represent my post well or at all.
My copyrighted photography & videos. All upvotes & comments welcome.
Photo taken with an HP945 ( http://bit.ly/2t1kUlx )
helloo
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Goodbye.
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