OK, lets start with your chart. Have you drawn it according to lecture notes and your experimental results? What goes on each axis? What is it's shape? You can google for online graphing applets, if you can't scan your chart into your post.
I've seen the pink, or purple, or yellow or brown residue left as distillation starts to go dry. FWIW, it's not very important, it's organic material charring. So that's just an observation for you to mention, to show you're alert the whole time. So there's not much for you to write up.