if you're gonna keep the left icons-sidebar, its probably a good idea that you label the icons - i think its mentally exhausting for all users to remember what each icon stands for all the time, and also you may want to change the icons themselves in future.

i'd also suggest to inline the left sub-menu: so much space under the left sub menu ends up unused. better to inline it at the top of the page, and widen the main content area.

anyway congrats on what you've achieved so far; looks great and best of luck!