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Either or. I just dont want small account abusing the reward and not upvoting fully but also allow big accounts to not have to do a 100% vote, they can be quite valuable.

Congratz, you are the only submission so far. Maybe u will win the entire price!

Update: not any more.

thanks @knircky . at the moment, I'm studying publishing posts using the steem-bounty.com web. I am still confused about how to upload photos. because I often make posts about photography.

Yea we do not have image upload implemented.

You can set a bounty also on existing post, or you can edit them in steemit ui and paste them into the steem-bounty ui.