this is how you use blobs of colour to make a picture. You can do this in real life with paint and a pen.
Here is how to:
Do a person in 'blob';
First get out the paint colour of the t-shirt. Paint it on the paper, not too much mind!
Then get out the colour of the trousers, do a blob underneath the t-shirt colour.
Next get the skin colour and paint a blob just on top of the t-shirt blob.
Then get the hair colour and overlap the skin colour with long strands of hair (girl) or another blob (boy).
Next get out your pen and start doing details such as t-shirt outline, trouser Outline, hair strands, trouser pockets etc.