The above drawing by London Illustrated News Special Frank Vizetelly pf the inside of Fort Fisher was featured in the May 2012 National Geographic Magazine in its Civil War Art article.
I've seen the drawing many times in the past, but didn't know it was done by Vizetelly. I was always struck by the two Confederates being obviously hit by Union shells/shot during the bombardment and there were several cannonballs in the air. In the meantime gun crews stood by their guns going about their duties. One gun had been dismounted.
A little more research showed that this drawing was of the Northeast Salient or Bastion, where the land and sea defenses of the fort came together. But, it was my understanding that the forts gunners spent much of the bombardment in their bunkers.
The caption accompanying the article reads: "English war artist Frank Vizetelly huddled inside Fort Fisher while it was being shelled by more than fifty Union warships. His drawing of the attack ran two months later as an engraving in the Illustrated London News.