Normally I don't bother editorializing about cartoons, but this thing has gotten so ubiquitous on the music ed-related Internet, I thought I'd say something about it.
Let's get this out of the way up front: to become an “average” expert musician, one of the things you need to do is to dedicate several-to-many hours a day to practicing, over a period of many years, which requires you to be very motivated and fairly single-minded. And let's stipulate that most people probably practice too little to actually achieve their musical goals, whatever they are.
That being said, I don't think this is very helpful:
Call it the be more like a crack addict school of motivation. It's hard to believe this isn't meant as a joke about musicians' neuroses, but the thing is so devoid of nuance, humor, or anything more elevated than the mechanical stimulation of the brain's guilt/competition center, that I can only conclude that this is how they want you to be. They're trying to be funny by exaggerating a little bit, but basically being a musician/music student is nothing more than an endless, mindless, all-consuming need to practice more. It doesn't work for me. If the only way you can get a student to practice is to make them neurotic about it, the hell with it, maybe that person should not be a professional musician.
And for the record, among the other things you “should be doing right now” if you are a musician are: listening to music, playing music with people, playing gigs, looking for gigs, booking gigs, going to other people's gigs, reading about music, writing music, playing piano, transcribing, creating/maintaining your publicity material, daydreaming about art, and just hanging with musicians. In fact I probably need to make a Should you be hanging right now? cartoon and post it on the wall of my studio. That would be really useful.