That looks much better. Now here are my thoughts:
1. Make the silver paint just slightly lighter in color (only by the slightest bit)
2. With the weathering, make it just slightly darker in color (only by the slightest bit)
*This will make both the silver paint and weathering more contrasting and easier to see*
3. Make the Roundels more vivid in color. The roundels should contrast well with the silver paint. Make the blue more bluer, and the white more whiter. Judging by those pictures, those roundels stand out pretty well against the silver.
4. You might want to make the prop spinners a little lighter too, as they look pretty dark when compared to the historical photos. The spinners may actually be the exact color as the rest of the aircraft.
Hope this helps achieve the look youre wanting to see!