Whoa, they look wobbly. That means they're hand-drawn, which I appreciate...seeing that drawing by hand is becoming a lost art. How are these done? Were they scanned in, done in a tablet, or something else?
Don't worry about it. Charles Schulz drew wobbly and became a billionaire from doing so. I have shaky hands, so no doubt I have to make very quick strokes or my stuff ends up looking wobbly. Here's what I do: After I've scanned it, I draw it over on MS Paint or GIMP (depending on whether I'm using a PC or Mac) and use the Curve Tool to draw over the outlines. And suddenly, it looks perfect! Voila.