At the roots on the tree to your left, you'll find a leaping toadstool; if you're unable to complete the progress bar make sure the items do not already exist in your trunk and try again.
On the lower trunk of the right-hand tree, there is a spider web from which a spider will crawl when moused over.
In the branches of that same tree, there is a raven that will fly away when moused over.
Mouse directly beneath the web that triggers the spider to reveal a set of glowing eyes.
Mouse to the right of the other glowing eye spot to reveal a second set of glowing eyes.