How to find unjoined gaps in your drawings?

I’m drawing a koala on sketchup, I did make sure that every new curve or line I made was joining the points around it. But now that I’m finished drawing, it wouldnt sum up to one solid shape to fill colour into.

Can you please have a look at the file? koal.skp (145.2 KB)

Many thanks!

I think you’re in good shape just draw a single line to help SU form a face. Then erase.