Yeah, in a workshop for an inventor, he'd probably have things close by. He won't want to be walking from one side of a big room to the other all the time. So one dirty bench with all his tools scattered around, shelves from floor to ceiling behind him and beside him, and a few things piled up on the floor, would probably give it more of a "scatterbrained scientist" look. The things on the tables are spread out too evenly, with too much space between them, and you really don't get tables shaped like that - in a U shape to wrap around walls (unless it's custom made) - I'd make them individual, straight tables, and clutter them up (use TileE to parallax stuff piled up to get rid of the weird spacing). And would an inventor really have a glass of beer AND two bottles on the table, along with another bottle or two on the other side of the room? Drinks can be spilled and ruin what he's creating, so it's more likely there'll be nothing consumable anywhere around.
Also, the set of scales on the table at the back of the room is not ON the table - it's floating in front of it.