After trying to a few tiger attempts, it seems to be picking pre-drawn shapes, although it did give a Lion as one suggestion.
Although it gives pre-drawn shapes as suggestions, I am surprised how accurately it picks up what I'm trying to draw. For example, consider the following crude drawing of me trying to draw a piano with my mouse:
The following are the first few suggestions that poped up - Two musical keyboards, a grand piano and three typing keyboards.
Once the shape is inserted, it can be coloured in with the fill tool. In the following, I tried two attempts of an owl (got several different owl suggestions), another tiger (which only gave that one tiger shape), a frog, a garden hose and the above piano: