Painting is a wonderful expressive medium for children to explore. It is different to drawing as it shows less detail, but children can explore colour, texture, and movement (as their whole body is used). It is another way to develop observation of their surroundings, and interpretation.
Try to limit their colour range so they don't turn everything into a muddy brown
Comment on how colours change when mixed
Encourage children to look at what is happening in their painting- whether shapes or representations are forming. Suggest what things may look like (e.g. a fish in a pond) to spark further ideas and get them to understand the idea of image making.
Cherish and celebrate their finished artwork. Display it on the fridge, or in a special folder. This will boost self esteem and pride.