Just a word on the A-320 wingtips. Not all of them have it. The early (-100) models don't.

The 737 tail cone has a curve up from the end of the taper to the APU exhaust. The A-320/21/19/18 has a straight pointy end (except for the CPU exhuast).

The 737-300/400/500 also have a piece that breaks the angle between the fuselage and the leading edge of vertical fin. The -100/200 do not have this (haven't looked at a -NG yet to see if they have it.

The 737-300/400/500 also have the engine nacelles flattened at the bottom for gorund clearance. The A-320 family sits higher off the ground.

Finally, the 737 front looks like a 707/727. The A-320 family seems to have a rounder nose.