Top view of the piston and combustion chamber would be good. See if the edges of the round piston is scarred. The pic of inside a liner would also be good.

I suggest once you clean everything, put it aside and when your brand new JP engine comes, try to fit the piston / sleeve inside with the JP conrod and assemble it like you want to start it. Turn the flywheel and put your ear beside the exhaust port to hear if there's excessive leakage of air trapped in the combustion chamber. If it's very easy to turn the flywheel or more importantly you hear a gush of air leaking out as soo as you turn your flywheel, then you know that the piston / sleeve is gone...