Sentence:  New England carvers between the 1720s and the 1750s transformed, step by step, the winged skull into the winged face, adding flesh to bare bone and turning the toothy grin of death into the <WSD>blissful</WSD> smile of a saved soul. 
Meaning of the word marked with <WSD> tags:  Extremely happy; full of joy; experiencing, indicating, causing, or characterized by bliss.