Here's another angle on how to cartoon: When creating a scene, a background setting for your characters and their props, first sketch out the composition relying purely on memory, as opposed to the majority of the time when we use photo reference and/or Google Image. This forces you to use a visual shorthand and render only those readily remembered elements that add up to give an impression of - in this instance - a corner store.
So in a way cartooning dovetails quite nicely with stereotypes and icons - components of residual, shared memory + cultural symbolism = short-cuts. Ho-ho's, gas-station quality coffee and ubiquitous creamers + sugar, the overhead a cigarette rack, newspaper rack, an ice-cream cooler. It's a puzzle where you also have to design and draw each of the pieces. Some assembly required.