Piece D has a notch that goes two-thirds of the way across the piece on the front side below the square cutout, and two uneven (asymmetrical) bump-outs on the back side below the square cutout. Piece E has a notch that goes all away across the piece on the front side below the square cutout, and two even (symmetrical) bump-outs to either side of the square cutout on the back side
The puzzle should look like about three-fourths of a completed ball (sphere) now—just two pieces to go!
Now you can take a moment to congratulate yourself for solving the puzzle!
This is Piece F.
This is Piece E.
These are Pieces B and C.
What to do now? Try timing yourself to see how fast you can put the puzzle back together. Or give the pieces to a friend and let them try to solve the puzzle!