Well I should specify that I don't work in AI, but to my eye, vectors have more of a smooth look with a thicker and more uniform line. However, just because it looks like a vector to me doesn't mean it is one haha! Your illustration looks good. For the shadow on his bag, you can make it more subtle by adjusting the transparency; however, having said that, the look you have can also be a good one depending on what you're going for. Also, FYI he appears to have two right feet. You can still duplicate and flip the right shoe you've already drawn, but there should be slight adjustments made to make it look like the left foot. You can do this by indicating the arch of the foot, which would show on the inward-facing foot. Like this:
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