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Second shot is great.
However it looks as though the camera is under exposing or Colorplus isn't a true ISO200 film and pushing to 1600 compounds that. Also the scanner may be trying to lift non-existent shadows. Either way, they look under exposed.
Does also look like a light leak :(I had similar with a ME Super - under exposed with similar light leak. Light leak appeared on a few frames on a roll at first, then progressively got worse. Whilst I do like the compactness of the Pentax M series bodies, I don't think they age that well.
Colorplus pushed to 1600 came back. Mostly shot in near darkness which came out ok. Daylight shots had this weird lightleak that I hope isnt caused by the body :( bit annoying as it was quite a few frames. Although this was before I fixed the issues with it so could have been related