Whilst the icons are generally well designed, I think there is a problem, particularly when you open the Tool and Select dockers, in trying to identify which tool or mode is currently selected, with the current black theme.

e.g. Tool menu disables everything when we're in selection mode...no feedback on screen we're in selection mode unless we also have the select docker open.

Possible confusion whether first line in Tool is a selection, and second is disabled?

Select-Fill tool makes sense but is at odds with Magic wand selection. 
How do "Fill" and "Dropper" selection vary? 
We see a change in feedback to user between Select and Tool dockers too. Tool docker shows current mode in top-left icon. Select docker has "select none" function in same place.