I actually only drew this illustration in order to color it and practice coloring in photoshop. However, it turned out like crap with color so I'm leaving it in black and white.
It's about going on vacation as a family or in a group. There's almost always one who's grumpy or dissatisfied with the plans for the day. Or someone who just wants to go home all the time. Grumpy cat to the left represents those persons. I've been a grumpy traveller now and then too, and I'm sure you also have ;)