I have two plants of this species.
The tiny speckles on the backside of the leaves are natural part of this plant.
I see some larger black (also appear indented) spots are probably some minor damage of some sort.
The slight ruffle or winkly look on the edge and near the tip of the leaves are also natural for this species.
Overall, your plant looks fine to me.
I'm a clean freak, so you can trust me on this. lol
Oh, by the way, picture #3 shows snail damage.
Nothing you can do about it.
Check the plant at night to see if anything crawls about on the exposed top portion of the mix.
or better yet, the next time you water, soak the entire pot for an hour or so.
The snail, if it's there, will either come out or die in there. lol
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