Comments attached to Deleting answers to questions indicate that there may be some confusion about what a downvote on a meta post means. On Meta Stack Overflow a downvote generally indicates disagreement and an upvote indicates agreement, whereas on main sites up and downvotes mean, roughly, that a post is useful or not useful.
Which convention applies on Meta Photo?
I'd suggest that we should follow Meta SO's model and use votes to indicate agreement/disagreement. Meta posts are often about building a community consensus, and using up and down votes this way allows a quick determination of how much support or opposition there is for an idea.
Whatever the decision, there should be some effort to inform the users about it. Photography and Meta Photo are sufficiently distant from Stack Overflow in terms of subject matter that many users here may not be familiar with the ways of Meta SO. Voting here will be less useful if there's a continued difference of opinion about what votes mean.