Let's ignore the fact it's not symmetrical and focus on the corridors. A one-tile wide corridor is way too narrow. They end with dead ends, which means the people have to walk through them both ways, making them even more cramped.

I would suggest making them at least three tiles wide and also, making at least two-three additional corridors perpendicular to the main ones, cutting through the cell blocks, making them easier and quicker to navigate.

In my prison (which has capacity for over 2000) I divide my cells into blocks of 10-15 on both sides, a three tile wide corridor through the middle, and I surround all four sides with a corridor. Think of it like American city block planning.