It's a good start
I think that you've certainly gone a good way to capturing the essence of Charles Schulz' Peanuts Cartoons. The facial expression of Charley Brown is a great image and shows that you've really studied this well.
I think that you could have done a little more with regards to the shape of Charley Brown's face and smoothed out some of the lines - these things come with practice, so they will start to look better after a while. I'd concentrate on the difficult parts, like the collar and places like where the legs join the socks. Paying attention to detail is a great thing here and doing something to the background wouldn't hurt.
I think with the background, you can get away with using a straight edge, as I'm sure that Schulz himself would have. Get that sorted, then do something about the colours - a more vibrant yellow, a more imposing black and making sure that you stay within the lines - there's the one piece over the left shoe that looks a little weird and out of place.
Taking those pieces in your stride, I'm sure you can make good progress.
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