It's funny because while it seems a lot of people worry about looking balanced, I've always been more attracted to an asymmetrical look. For example, maybe having a 3/4 sleeve on one arm and a full or half on the other, with the opposite side ribs done on the short sleeve side, etc etc.
I'm still early on in my tattoo experience but the more time goes by and the more I take in the culture, the less and less I care about uniformity and the more it's just fun to get tattooed.