I have seen this art lesson on a number of blogs and Instagram. I used this lesson as a simple way to introduce students to mixing tints (and talk about shades)
Students first drew a face shape large in the middle of an A3 portrait piece of paper (I demonstrated). They then drew a semi circle to cover the bottom half and drew the nose, eyes, eyebrows, ears and hair.
Three students shared a daisy plate pallet with dark green and white. First they all used the unmixed green to paint the round edge of the semi circle. Then one student scoops a big blob of white with their brush and mixes it in with the green for them all to paint the second line inside the dark green. Another blob of white is added to make a lighter green for the third line of green, slightly blending at the edges.
We had time to paint the face and a pair of hands that they traced and cut out.
Next lesson, students painted the background and shoulders. They could use tempera paint cakes or liquid water colours which dry fast. I had the red and white paint ready in daisy plates ready for mixing to paint the watermelon flesh. They used the red paint to fill the semi circle leaving a strip on the round edge to use white mixed with red to make pink.
Black seeds were painted with a thin brush and tempera paint. Then the hands were glued on with the thumbs to the outside, fingers over the edge of the watermelon.
Lesson plan with learning intentions, success criteria, lesson activities, examples.