40s
adult
arms
black
blackboard
board
candid
casual
caucasian
chalk
class
classroom
college
confidence
confident
education
educational
gesturing
greenboard
hall
hand
happy
indoor
interior
knowledge
learning
lecture
lifestyle
looking
male
man
mature
men
occupation
people
person
pockets
pointing
portrait
profession
professional
professor
raised
school
showing
smile
standing
student
teacher
university