20s
adult
arms
attractive
blackboard
blank
board
casual
caucasian
chalk
chalkboard
class
classroom
college
confidence
crossed
desk
education
educator
exercise
glasses
green
hands
happiness
happy
instructor
intelligent
knowledge
lecturer
lesson
looking
male
man
occupation
one
people
person
portrait
professor
scholar
school
science
smile
standing
student
teacher
teaching
university
white
young