It uses genetic markers to estimate traits such as eye colour, hair colour, skin pigmentation and ancestry of an unknown person.
Some pigmentation traits are predicted reasonably well, but face shape prediction is less established and images combine estimates with assumptions.
No. DNA does not determine age, weight, hairstyle, scars, tattoos or lifestyle effects on appearance.
Genealogy identifies relatives through database matches and can lead to identification; phenotyping only estimates appearance and rarely identifies anyone alone.
No. Predicted faces are estimates, and suggesting lookalikes can cast suspicion on innocent people; send tips to investigators.