The most memorable work often contains something slightly unexpected.

The thing that stays with you is almost always the small wrongness: the note that should not work, the sentence that turns, the colour that clashes and holds the picture together. Complete predictability slides off memory because there was nothing to catch on.

When you make something, look for the place where you played it safe and consider putting something odd there. Not strangeness for its own sake, just one element that was not required. That is usually the part someone remembers.