The girl is touching the metal spring that has been sitting in the fire for awhile. This shows conduction because the heat energy from the fire has spread to the metal spring, so when touched you would burn yourself.
The girl is outside outside enjoying the cool weather. This shows convection because cold air sinks while warm air rises.
The girl touched the doornob and felt the heat of the sun on the doornob. This shows radiation because the suns heat is radiating from the sun onto the doornob. Which causes the doornob toabsorb the suns heat.