A solution that is:
Isotonic to the cell would cause no visual changes as the rate of water entering the cell is equal to the water exiting the cell.
Hypotonic to the cell would cause the cell to shrink, as water exits the cell to dilute the higher solute concentration outside the cell.
Hypotonic to the cell would cause the cell to swell, as water enters the cell to dilute the higher solute concentration inside the cell.