Electron displacement for the mesomeric effect

I would like to add a figure to show the principle of the mesomeric effect but I have a problem on the last carbon (on the right): my electron movement in magenta does not arrive above the carbon as I would like and the two bonds of this carbon are obviously badly placed (they are a little too low).



I can't see which command I wrote wrong to arrive at this (bad) result!

You should place the node before the atom

an not

Example: