The cartoon woman might be waiting because she's got an appointment or she's just enjoying the moment and taking a break. Maybe she's waiting for inspiration to strike or for a special event to start.
There could be a number of reasons. Perhaps she forgot something in there and is waiting to get back in. Or maybe she's waiting for someone else to come out of a stall.
Maybe she's waiting for her turn or there's a problem with the facilities inside.
The woman might have a look of anticipation, maybe standing still with her eyes fixed on something in the distance.
Maybe he's waiting to buy something popular that's in limited supply.
Maybe they are hungry and it's time for their meal.
Maybe it's because it fulfilled its mission on earth and was called to a peaceful place in heaven.
The cartoon cars might be in line waiting because they are at a car wash or getting inspected for safety. Sometimes in cartoons, they line up for fun and adventure too!
You can start by sketching the basic shape of the woman. Then, add details like her expression and clothing. For the line, draw simple lines behind her.
The reason could be that they have been working hard and now it's their time to take a break and enjoy some peace. Maybe there's a special relaxation area for them and they're waiting to get in.
Maybe he's a big fan of cartoons and it's his way to relax and have fun after a busy workweek.