This graphic really looks great! My only issue with it is that it's misleading to say "Earn steem by being first to upvote popular content". By making people think they need to be first to upvote content, it may discourage upvoting when a post is already upvoted. For that reason, I would suggest using one of the sentences below.

Earn Steem by being among the first to upvote popular content.
Earn Steem by being early to upvote popular content.

(maybe also throw in the word "more" after "earn" i.e. "Earn more steem by being early to upvote popular content.")