Wrist and shoulder pains are problem, and not all of it is due to posture. It's probably because they're overworked.
Plus you haven't been practicing on a regular basis, the upper limbs aren't used to being used too much. All you need to do is to continue practicing and ensure that you give those joints enough rest, don't overuse them for anything else.
I presume the right knee is because of the sustain pedal?
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