I do this every time I make something new. Sometimes I feel like I've run out of steam, like I'm out of touch with something I used to be... I still adhere to my old mantra of "if I don't laugh at it, I don't submit it," which seems to keep everything in order, but there's certainly something else I need to channel in order to keep things consistent with my older stuff.
Then comes the question of whether or not I want everything to be consistent. Consistency is the easiest way of becoming boring and stale, and I always try to embrace how my sense of humor has changed (trying not to use the word "evolve"). I might be overworked, or under inspired for whatever reason.
I did laugh at this one, and I was pretty proud of how it came out, but I see where it can change, then again, I would only want to change it now because I know it would appeal to more people. I like how I made this one, and I wouldn't really change anything. Hopefully you'll dig the next toon I do!