Covered hands

Dirty hands

Human skin

Manual labor

Hard labor

Dirt on fingers

Grime on fingers

Artistic expression

Human hand

Black substance

Mechanical parts

Human hands

Tools of trade

Craftsmanship on display

Hands at work

Hand protection

Hand washing

Hands in harmony

Brown dirt

Mechanical work

Tireless effort

Stained skin

Manual work

Hands at end

Skilled labor

Filth on human skin