In the 60's-70's, you would use sweet to describe a girl who was innocent looking, probably conservatively dressed, nothing wild about their hair style, subtle makeup,  a touch shy or even submissive acting. Body pose, hand pose, face expression, and especially the eyes can create the sweet image.

As explained above and the fact that the word "Sweet" has become slang for "cool" or "good", you could create a "Sweet" render of V4, if you posed her barely dressed, in a temple with a sword!

Gary

"Those who lose themselves in a passion lose less than those who lose their passion"