Step one: with the pen tool delineates the contour.
Step two: apply the basic colors.
Step three: apply some darker shades in the areas you think are necessary.
Step four:with a darker tone to the base tone gives shape to the muscle areas
Step five: give the latest details with shadows and lights
Step six: Add a nice background! 
Ready you created an illustration. fast and easy
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I hope you liked it...
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HAPPY DAY TO ALL MY FRIENDS OF STEEMIT!
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[VOTE AND COMMENT]
Dear steemer,
nice post and I followed you :) Please follow me :)
with pleasure