Is nudity when drawn in private sinful? Not necessarily pornographic nudity but just nudity in general. Nude drawings that will never be seen by anyone but myself?
What is the purpose of the drawings? I took note that you said, "not necessarily pornographic," which hints that your primary motivation is revolving around your sexual desire. Feeding your desires will lead to sinful behavior. "For from within, out of the heart of men, proceed the evil thoughts, fornications, thefts, murders, adulteries, deeds of coveting and wickedness, as well as deceit, sensuality, envy, slander, pride and foolishness. All these evil things proceed from within and defile the man" (Mark 7:21-23).