Drawings I made when I was a kid

I have a very old book that my uncle gave to me when I was about 4 years old. I've managed to hang on to this book for years. In it, there are little drawings I made, copying the photos in the book. I must have been around 4 or 5 when these were drawn. What's funny is that even at that age I liked skeletons. I copied an image of an x-ray of a common mole. (you can see the little drawings at the bottom of the photos shown above)

At that age, my mom gave me coloring books. I didn't care for them. I preferred to draw on the blank inside covers of the book.