I was also challanged to "post" the / this / any masthead...
The way the masthead works is I have to download the file and save it on a specific location after adding the name and date. I want to be as true to the original image as possible, but the process may introduce some variation... it concerns me, but that's the system.
My experience with filters is that it helps to have some color in the sky for the filter to have noticable effect. A "white" sky is difficult to deal with. I have yellow, orange, and red filters (in order of impact). The red is somewhat challanging for ttl metering, rather to meter without the red filter and add-in the filter factor. The ttl metering with a yellow or orange filter is close enough most of the time. Keep in mind that the filter will have an effect on the entire subject, based on the characteristics of the filter used.
I have been known to use a "PL and Red" or "UV and Red" combination
When using color film, I have used a color temperature meter to match a color temperature filter with the scene and the rating of the film... it takes some time but it's one way to keep the white balance somewhat workable
I really like the scale of this image and the detail (in the water for example). Definately worth another visit or two