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(BTW, I will always try to show the source for lessons I share but in some cases I don't remember where I found the idea. Feedback in this area will be appreciated.)
I suppose there are many ways to approach this lesson. Here is my approach: One can use either an overhead projector, or a digital projector. I've used both. I demonstrate how to draw the clown (again, referring to the names of the shapes or lines I am using). I have found over the years that many students need that extra help when drawing. They either draw the images too small or too skinny or in some cases, say they can't draw at all. I model how to draw the clown but that isn't always necessary. However, I model only the basic parts (head, body, arms, and legs (shoes too)) and have them choose how to draw the hair, hat type (or no hat) and designs on the body. Some kids venture out on their own, others copy the details of the model. - Just as a side note, the technique for drawing the clown feet come from Mark Kistler's Draw Squad method.
After students complete their drawing (using pencil) I then have them outline their work with black marker followed by coloring with markers. For coloring this particular project, I have the students use a method I learned from one of the segments on the Donna Hugh Videos. (I'm pretty sure this is where I learned it but am not sure). The middle-school students use this same method and the art teacher calls it the Mr. Triplett Marker Method. Pretty cool.
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After the pictures are completed, I have the students mount them and then they are displayed either in their rooms or outside the rooms. You can see student examples here.
In some activities of a similar kind, I have allowed for the backgrounds to be colored using colored pencils or crayons. Details are all colored in markers (using the above mentioned method) and backgrounds can be colored with crayon or pencils. It's a nice light background contrasted against the darker color of the markers.
What I like about activities like this one is that they gives me an opportunity to talk about design, overlapping, background, details, positioning, etc. Concepts about line and shape can be reinforced and principles such as repetition, patterning, balance, etc can also be introduced.