As A Massachusetts guy-

Doubled up neutrals- very wrong.
As far as GEC- Based on bonding screw- lower left corner.
(1) Perhaps it is plastic water pipe (main)= no connection.There fore no visible GEC in panel.
-Unless done all in 'PEX' I'm concerned about no bonding conductor to what little copper pipe there may be.-
(2) 2 ground rods- connected at the meter socket (not uncommon here).
(3) Uffer extended outside,same as above.

As far as the SE cable, very common here as well.
I can't see enough below the panel to comment on UG or not.

Basically,looks OK.