Prioritising picture choice selection

Hello,

I’m trying to use the ‘picture choice’ function to rank a user’s selections. The order they select them is visible in the submitted responses but it is not clear to the user at the time of selection, which ones are 1,2,3,4,etc

If the user selects their choices without changing their mind then it is kind of ok, but people are people and change their minds! An ideal would be to have the selections numbered (just like say on FB when you select a number of images to post) - I assume this isn’t possible, but can anyone suggest a good way of ranking images?

I’ve seen this post: 

But I have 17 items to choose from, so that approach doesn’t really lend itself

Any thoughts much appreciated

Lewis