Flying low is different to flying at circuit height. You can't see as far and in turns you may well not have a visible horizon. The effect of wind on ground speed is visually much more apparent and careful airspeed control is essential - don't be fooled by how fast the ground appears to be going past.
And turning in a wind can look as if you are slipping or skidding across the ground, so again don't be fooled by this by inappropriate use of rudder - just keep the ball in the middle.
The purpose of the low flying exercise is to familiarise you with these unusual visual effects in preparation for the day you do it for real, either in bad wx trying to keep a field in sight, or perhaps low level maneuvering into a farm strip avoiding noise-sensitive neighbours!