This is a racing car which is being fixed. The wheels are off and the hydraulic lift underneath is for the mechanics (notice their toolbox). The car is fueled by kerosene. Mom added colour for me.
Tom's dad has a book with very detailed drawings of ships. Today Tom drew these while looking at this book. Note the broken arm from a playground accident: only one week later, the cast is already looking grubby.
An experiment: what happens when you mix water (blue), lava (red), acid (green) and electricity? The ingredients in the experiment are recycled. The first three pictures are detail, and the final is the whole picture. Click on a picture to look at a bigger version.