The construction at the main entrance appears to be pretty much complete, so things are nice and open as you walk through. You can walk up to Spaceship Earth, but there are walls now around the back of it and to the sides so that you have to go around towards either The Seas or Mission Space (and up the side of the under construction Guardians ride, formerly Ellen's Energy Adventure) to get anywhere. The entire core of future world (so from was was Innoventions East and Innoventions West and everything in between, including where the big fountain used to be) is now walled off for construction. All that said, it's really not that bad. All of the attractions are still accessible, you just have to walk around a larger perimeter to get where you want to go. When I was there end of March there was no construction in World Showcase other than perhaps finishing touches on the Ratatouille ride, which is tucked back in a corner. For pictures I would recommend googling for Epcot construction updates 2021. There are a few sites than can provide pics, updates, and some birds eye views of the entire project to give you an idea of what you are dealing with. If you like spending time in the World Showcase, the construction will have little impact on your visit.