Step 1
Before opening up Illustrator start with a quick pencil sketch. We’re going to use the Pen Tool to trace over the lines to give the cartoon a polished feel. The sketch doesn’t have to be perfect, it’s just a point to work from.Import the scan onto the artboard and then set the transparency to about 25%. The transparency makes it easier to see the lines you’re drawing on top of the sketch.
Step 2
Before we start tracing, we’re going to create a set of brushes that will give the outlines a more traditional ink look. I used the Pen Tool to make some shapes that look like rough lines. The width is varied in spots to give the strokes a personality.Step 3
Once your happy with some of the line shapes, convert them to brushes. Start by selecting the shape, then go to the drop-down menu of the Brushes Panel and select New Brush. There are four brush options. We’re going to make an Art Brush. Once you select Art Brush there are more options, but we just need the default settings.Step 4
When we start tracing with the Pen Tool we have the Stroke set to black with no fill color. There are a couple exceptions, the eyebrows have a fill so that we don’t have to break the line around the character’s head.Step 5
Once you get a couple lines drawn, open up your brushes again (F5). Add some of the custom brushes we made earlier to the strokes. This is trial and error. On shorter strokes some of the more detailed brushes might not look right. You can adjust the weight of the strokes to give some elements more importance.In the example below, I added a thicker line (2 pt stroke) around the head and a lighter stroke (0.6 pt stroke) to the chair to draw attention to the more important elements.
Step 6
Once all the strokes are drawn in, it’s time to add some color. Start by creating a new layer under the strokes. Then using the Pen Tool to start outlining the shapes on that new layer. It’s not a bad idea to lock the layer that your strokes are on so that you don’t accidentally close shapes while adding color.You can move fast coloring because the black stokes hide the edges of your color so you don’t have to be super exact with your points. We’re using solid colors on these examples, but gradient color fills can look really sharp if used right.