Nice little character tho there are some major flaws in your animation:

• The far arm and leg move in unison, when they should be opposite, as in when far leg is forward far arm is back
• At the passing position (which should be 3 and 6, but looks like 3 and 7 in your animation) when one leg is straight down onto the ground the torso should lift, this should traditionally be highest point of the walk/run. In your version it looks like the length of his legs change.
• you seem to not have done proper keyframes and many parts look animated on the go, which usually (unless you are VERY good) yields sloppy results. I am sure you have seen this before but I shall repost it as it might be helpful (I should actually revise it at some point as it could be better)
  
• Your first frame is him up in the air, where it should probably be his heel touching the ground, and so on.
• Usually run/walk cycles should be even framed, same amount of frames per step, but in the case of having a peg leg or someone with a limp it can look nice if you make the step with the pegleg 1 or 2 frames longer, given you manage to show the added weight and all that. Here is a little pirate walk with 7 instead of 6 frames I made for Dr. Dobbs Challenge 2.
  
• Lastly the hand holding the tablet not moving at all does look really unconvincing, it would be funnier and look a lot more natural if the hand with the item would sway around in some circular or figure of eight motion.

I hope this all helps, if you have specific questions about some stuff, just ask