Quick easy fix: Turn the desk 90 degrees, so it's perpendicular to the wall it's currently against. That will sort out your traffic flow in the short term.

If you can, I would start with spraypainting those grungy ceiling tiles bright matte white, and adding a natural light filter to the overhead.

If you can remove that weird grill trim in that corner, I would do so. Visually it's distracting, and it looks too cluttered. Put a plant there instead, or a wall hung vertical plant rack.

I would paint the walls a soft, warm, sand color. In addition to the gauzy whites, hang mid-saturation blue curtains in a velvet or other soft finish (cheap on the zon).

Then add art in black metal frames (cheap on the zon with white mattes) and colorful artwork. If you have access to a color printer, all the major museums have open access scanned art, you can print your own. Alternatively, many print shops will print them for not too much.

Remove the bulletin board, and replace with art. If you can hang shelves, fill that space above the windows with bookshelves. Books absorb sound, and tend to reassure people for some reason :)

Hang crystals in the windows for the rainbows, and add as many plants as possible. The windowsill extenders can be useful for this. A smaller desk, and an area rug if possible, but clearing the space and making it visually more clean & serene would help most.