Please don't take this the wrong way but perhaps you should consider some more substantial foot ware when working on cars. The amount of times I've bounced things off metal toe caps and thought "well that was lucky" are more numerous than I care to remember (!)
Whilst it can be enjoyable to polish and clean - and it is important (probably about 90% of my time is spent cleaning stuff getting ready for the next stage) - but after a few revolutions of running an engine will look pretty similar to that shown in your pictures.
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I have tried on numerous occasions to make some decent pictures of cylinder bores to demonstrate the following but it has proved to be very difficult =>
Whilst many people will say to look at the top of the cylinder and measure the lip where the piston rings stop traveling there's often uneven wear on the walls of the cylinder that are more likely to cause problems.
This uneven wear looks like shadows on the side of the cylinders. Noticeable wear is more likely to be orthogonal to the direction of the crank.
If in doubt get a machinist to look at the bores - a trained eye won't need to measure a worn bore - failing that bore micrometer and measurements to make sure the bore is still round (not oval).
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If you suspect piston rings then you need to remove the pistons
BUT - be aware this can be a route to an expensive experience.
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