What significance do the following objects have in Part One of the book? What do they tell about the characters or storyline?

I think the drawings represent Mr. Tushman's fondness for his students which includes Auggie. The drawings also represent perceptions of how people see each other. Auggie and Mr. Tushman discuss whether he (Mr. Tushman) looks like a pumpkin in the picture. This ties into how other's perceive Auggie.