1.Post image : not really. It incentivize good/long articles than simple images
#photography does work fine though2. It's not PoS but DPoS
https://bitshares.org/technology/delegated-proof-of-stake-consensus/
http://bytemaster.github.io/bitshares/2015/01/04/Delegated-Proof-of-Stake-vs-Proof-of-Work/
Thanks for the answer.
1. Do you mean in the infographic or in Steemit? The examples in the infographic are supposed to be simple representations of posts that users are able to post into Steemit, like icons.
2. As above, the example is just an example of user content, not about what Steemit is.
Hope that explains it.
confusing though