pin1 of jp2 should probably connect to ac2 of the power supply and MOV instead of pin2 of jp2. Otherwise it wont turn on at all.
Should put fuse and relay contact both on the Active mains input.
IEC C13 and C14 would suit this IMO.
You are probably not allowed to sell into many countries without getting certification/approval.
C3 maybe 100nF.
(Always good to sprinkle 100nF everywhere in electronics.
)
I think MOV is ok done like that.
Noise suppression depends on local rules, also psu manufacturer probably gives guidance on this.
I don't think you would want a big cap like that.