I am very concerned about you using this thing as a standalone supply.
I think the intention is that this device is to be built into equipment which needs to obtain a "floating" 5V from the mains,with the whole unit double insulated.
Even in that case,it is very suspect,as the clearance between the mains input tracks on the board is way too small for safety.
Are you sure the two mains connections are correct,as it is usual to have the A & L connections separated either by non metal sections,or
several "dummy" tracks which do not go anywhere,but help to separate the two mains inputs?
I don't see any mains earth on your circuit,or did I miss it?
You may be taking the utmost care,but your picture looks downright scary!