I like this one, because it has clever slapstick and exasperated faces: something I live for. Too bad it's ruined a bit by the "Paint" effect, sorry. And the handwriting. Anyway, the timing is great on this one. What will they think of next?
Color: The sand on the 'background' in first panel is skin-colored, not sand-colored. And notice how the 'real background' colors change with the mood!
Pop Culture... ish: Not really referenced, but I'm using a trope that was popularised by Mission: Impossible. The ceiling bit. It has mostly been used as a nod, but to me it's a just a trope. The title ("Mission: Blank") is also just the trope. So, not really referenced. Meh.