Just a few things I can spot, if you're looking for "horribly drawn" reasons...
-Both of their mouths look a little off, Koishi's more than Satori's. -Satori's 3rd eye looks rushed, and seems to be missing some of the strings or veins that come off it (eg the bit at the front that looks like a hangman's noose) -The heart on the headband looks crude. -Buttons on a blouse that has no opening down the middle. -Those ears. I know they're humanoids, but ears are not THAT close to the face. -They have no visible noses, although that may be an artistic choice (which I personally think is a crap reason, but whatever, opinions etc) -Satori's right hand seems off. -Koishi's hat looks too small for her head.
I might be nit-picking at this point. Did I miss anything?
I think the problem with the noses this artist draws is that they're off center relative to the perspective. Here, they've put the dot nose straight in the middle between the two eyes, when she's facing slightly away. The more I look at it the more it bothers me o_o.