Hello Andreas.
I allow myself to give you a way after testing it.
For the result, you've done almost everything already.
You have already your three variables (something like : VarDonald, VarJo and VarArty (Mister Articulate)).
Then set a new layer AND THE WINNER IS that appears (with a trigger) at the end of your clock animation.
You can display the scores again just like you did on the base layer if you want.
Create a new RESULT number variable and use 3 triggers:
to set the value 1 on this RESULT variable if VarDonald> VarJo AND VarDonald> VarArty (means Donald wins).
to set the value 2 on this RESULT variable if VarJo> VarDonald ANDVarJo> VarArty (means that Jo wins).
to set the value 3 on this RESULT variable if VarArty> VarDonald AND VarArty> VarJo (means Arty wins).
Now use the value of the RESULT variable (1, 2 or 3) to change the state of any text, image, or whatever you want on that layer, depending on the winner.
I hope to be clear. Maybe someone else has a simpler, more elegant solution.
PS: don't forget to "prevent user from clicking on base layer" in the properties of the AND THE WINNER IS layer, to avoid more votes after the vote is over and preserve democracy. :-)