Not quite confident in your drawing skills. In order to become more confident you need to draw everyday. I have included this link so that you can practice at home. Check out the drawing categories and series offered.
Note: If you practice drawing at home do not use your class sketchbook. The sketchbook is for class assignments only. I encourage you to practice so that your work in class is better.
Have fun!
http://drawinghowtodraw.com/stepbystepdrawinglessons/series/animals/