1. Add Nazi Propaganda where possible.
2. Add shelf on upper left to add radio user manuals, code books, etc.
3. Finish off gauges and dials with needles or other gauge facing and labels.
4. Add storage under the table; boxes of food, equipment, ammunition...
5. Replace enigma device with photo realistic or better rendered item of same.
6. Make desk lamp functional, on/off with light beams.
7. Spice up the dials to give them some life/realism.
8. Make Record player clickable on/off, interactive.
9. Add desk items, paper trays, pencil cups, note pads, code books.