I've got:

A1: Fire Island, NY
A2: Portland Bill, UK?
A3: Gay Head, MA
B1: Baker Island, MA - that was tough!
B2: Drum Point, MD?
B3: Not sure, but it looks African or South American.
C1: Sambro Head, Nova Scotia?
C2: Admiralty Head, WA
C3: Montauk Point, NY
D1: Leuchtturm Westerheversand, Germany?
D2: Something German?
D3: Cape Elizabeth, ME
E1: Yaquina Head, OR?
E2: Coquille Inlet, OR
E3: New Dungeness, WA?
F1: Grand Haven, MI?
F2: Portsmouth Harbor, NH?
F3: Pemaquid Point, ME
G1: Old Point Comfort, VA
G2: Trinidad Head, CA (Replica I think)
G3: Barnegat, NJ
H1: Not sure if this one is actually real...can't tell with the painting.
H2: Old Point Loma? (Guessing you'd know that one)
H3: This looks like another version of Portsmouth Harbor, but in painting form.

Wow, these international lights are tough...