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Normally,the the bulk of NMOS is connected to GND.
Of course,I know some process can support the bulk of NMOS connect to it's source(not GND).
Added after 24 minutes:
The transistors must be operation at satuation region,so:
1.M1 operation in satuation region:
Vin,CM<Vdd-Vdsat1-Vsg2
2.M2 operation in satuation region:
Vp-Vin,CM-|Vth2|<Vp-Vth4
--->Vin,CM>Vth4-Vth2
To improve ICMR,connect the M2&M3 bulk to VDD.
To improve PSRR and noise,connect the M2&3 bulk to source.
It depends on the process you are using. if it provides the double well process, you can connnect the bulks of PMOS and NMOS to its source ( well).
However, usually they just provide the NWELL process, that means you can connect the bulk of the NMOS to ground while the bulk of PMOS to its source or VDD. vice versa.
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