Hey Per,
Some additional weathering and staining of the walls and equipment would help to enhance the general atmosphere of the scene, make them look used and well worn,
I can't tell from the photos but some more oil, grease and fuel stains on the floor would also be appropriate.
If you've ever worked in a garage or vehicle repair shop, the one thing you can't avoid is spilled oil or fuel on the floor.
All in all it looks very good.
Looking forward to the finished product.
Cheers

jjumbo