I love seeing so much improvement in your work. Definitely photoshop photos of your sketch pages. You can take the saturation down to 0 as well which will help when using levels.
Just one designer’s take. I tend to like to group things into as few elements as possible. So all the controls are at the top (I was indicated a touch screen there and just one or two physical buttons. The drip tray part break relates very much to the form to visually eliminate a line again. The cup dispenser I just didn’t think it needed the extra complication. Most gas stations have those dispenser things built into the counter or racks on the counter. This way it would be conceivable easier to gang 3 or 4 of these in a row as well. But I didn’t put too much thought into it. If I was doing this as project this would be an area of investigation of course.