Thanks for your response.
Thanks for pointing out the power symbol and I have updated my schematic, accordingly.
Yes, by grounding, I meant connecting negative(-) of the DC supply. So, the neg(-) of DC will be connected with AC neutral and touching may be very risky. In such a design, is it suggested to use a ground plane in PCB as it will cover the whole PCB and more risk associated with it?
Should I also put AGND on AC input side before bridge? I have used only on the rectified side.
Secondly, I have a Zener diode of 5.1V/1W rating and using 3V3 LDO, there might be a loss but as it is powered through mains then no big deal? Should I replace it with 3.9V/1W one?
Thanks