Can you tell what a person looks like from analyzing their DNA sample?

NO absolutely not.  The parts of the DNA the crime lab looks at are called “Junk DNA.”  They serve no purpose in determining the appearance of a person.  Those locations were chosen only because mathematically they are drastically different in different people.    The crime lab only compares the chemical make-up of the unknown DNA from the crime scene to the chemical make-up of samples from other crime scenes or actual people.