How to make the sims look exactly like you?

This may sound odd, but grab a mirror, and look at your face from varying angles, and add what you see. Or use a picture for reference. For me, although I'm no artist, it is much like drawing a portrait. Sometimes for certain hair styles or eyes, cc works a charm.

Just take your time with it and do the best you can, you should be able to get a doppleganger in no time.