well, there's a couple of ways to handle this.
1. Deal with it, almost every single webcomic is like that.
2. Keep drawing in the same rough way as you started no matter how much better you get at it.
3. Draw teh characters ALOT and the same withthe enviromments, then choose your final style. Delay the webcomic one or two years doing this, then start drawing it, the difference should cease to be dramatic.
The first option is the most logical, really, but there you have it.