The artist had drawn a beautiful portrait of
herself and her husband, whom was standing beside her, smiling at the camera.
A. herself and her husband, whom was
Incorrect. The use of 'whom' is incorrect as it acts as a subject in the modifier . 'who' is the correct usage.
B. herself and her husband, who was
Correct. This statement correctly uses 'who' to refer to husband and all modifiers are properly placed.
'smiling at the camera' correctly modifies previous clause with the agent 'husband' .
C. herself and her husband, he was
Incorrect.The use of 'he' is incorrect. It acts as a subject of clause, but the clause is separated from previous independent clause via just a comma which is incorrect. A coordinating conjunction is required or a semicolon instead of comma.
D. herself and husband; he were
Incorrect. Use of plural 'were' for singular 'he' is incorrect
E. herself and her husband, standing and smiling at the camera
Incorrect. The artist had drawn a beautiful portrait of herself and her husband, standing and smiling at the camera standing beside her, smiling at the camera. This statement doesn't specify the meaning correctly. The
' , standing ' form can modify the previous clause or husband . Also ,
'camera standing beside her, smiling at the camera' suggests that camera is smiling at camera.