Nice job! Some minor things you can work on would be:
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Adjusting your font styles a bit to emphasize the different types of content. For example, your image caption doesn’t need to be in the same font as the rest of your body…unless you feel it is equally important
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Your code snippets should be a different style/color. My favorite solution is http://alexgorbatchev.com/SyntaxHighlighter/
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You don’t need to provide large screenshots some of the steps. A cropped version of just the area in focus would be better.
