I think an "it's complicated" is warranted here: on the one hand, the shading and et cetera seem to match the LPC style really well. The outlines probably shouldn't be pure black. But otherwise, it looks pretty good. However, it doesn't match the perspective... but on the other hand, it isn't trying to, given the nature of what it's trying to show: items that one might have in one's inventory. And the author is right that we don't really have guidelines here. So that actually makes judging this hard.