The issue you're running into is that %FoundImage% is a token, not a variable, and you're trying to use it in ways that only variables can be used. Fortunately, the solution is simple: just set a variable to %FoundImage% and use that in the actions instead, and everything should Just Work™:
Use FoundImage in Other Actions.kmactions (24.0 KB)
(you'll also notice that I used the .midx and .midy references in a %Calculate% token for the Display Text action, as that's the only way to perform calculations with variables in a standard text field)