Ink set for inkjet recording and image forming method

An image forming method, comprising:

• applying an ink composition to a recording medium by ejecting the ink composition from an inkjet recording head, the ink composition including a pigment, a water-soluble polymerizable compound, and water;
• and
• removing, using a maintenance liquid, any of the ink composition that has attached to the inkjet recording head, the maintenance liquid having a pH higher than 8.5 and including water and a water-soluble organic solvent having an SP value higher than 27.5 MPa1/2, the amount of water contained in the maintenance liquid being 50% by mass or more with respect to the total amount of the maintenance liquid, the amount of water-soluble organic solvent contained in the maintenance liquid having an SP value higher than 27.5 MPa1/2 being from 5 to 30% by mass with respect to the total amount of the maintenance liquid, and an amount of water-soluble organic solvent contained in the maintenance liquid having an SP value of 27.5 MPa1/2 or lower being less than 5% by mass with respect to the total amount of the maintenance liquid.