Ignore the number for a sec; Sketchbook: Full Color's is just barely entertaining enough to get a shaky, half-hearted recommendation. A fusion of iyashikei and slice of life comedy, the two parts never fully blend and the latter will be carrying the slack for the former. When it's just the colorful cast getting up to their antics, it's pretty alright. The characters are endearing and there's just enough variety between them to be refreshing and prevent anyone from getting annoying. It's not gonna have you busting a gut but it's enough to have you grinning every so often. However, the other half of the show is where it might start losing you. When it switches to Sora's shallow contemplation, it dips a little too far into the iyashikei and becomes tedious. It is just far too insubstantial, without the ambiance that other more tolerable iyashikei have to at least make the time pass. I also found the cat segments to be quite annoying, too, partly because of the obnoxious voices they have, partly because of the fatuous scenarios themselves, and partly because of just how long these segments take. Unlike the human characters, where the brevity of any given segment typically breaks up the monotony, the cat bits drag far too long. Less fuzzy fun, more hairball in your throat.
Overall, even though I think there are plenty of times where you'll be looking at the timecode, itching to fast forward, or start staring at the wall or trimming your nails, or otherwise falling out of it, the art class and their shenanigans are just engaging enough to make this worth checking out, but you are forgiven if it's just not enough for you. If you don't find yourself caring enough to stick it out for the humans, you won't be missing anything if you decide to drop it.