Does the presence of imperfections in the universe disprove the supposed perfection of its creator?

God supposedly has freewill, and yet he does not make imperfect decisions. If humans are miniature images of God, our decisions should likewise be perfect. But the occupants of heaven, who presumably must have freewill to be happy, use that freewill to make imperfect decisions (Satan and his followers). Would humans who later transcend to heaven do differently? And if 2/3 of perfect beings who were originally in heaven betrayed God, how could heaven ever be sinless?