Does the tool options popup squish the view or appear over it? What is this page with arrow up? Send to cloud? Do you think help will be used often enough to warrant a toolbar button? Is left toolbar still so wide in fullscreen mode?
(Yes, I know it's only a mockup; I'm asking about your design decisions.)
In this version it is always open because on the bottom half is the layers panel. The icon with the up arrow is to export and cloud syncing is automatic. The help icon pops-up a tool tip screen so when you roll over other icons, areas, etc you will see what is does and manual link. The help icon in the new version is not there; it's layout is better. Also in the new version, the inspector is default narrower and adjustable.
The new version is going to be done by today or tomorrow.