If you're lighting one source with the light source of another, try to use only the light colour. In this case the only part of the sunset light affecting the archway would be the brightest yellow; and considering the archway is generally lighter in colour than the sunset to begin with it wouldn't be affected by it very much.

Nice idea btw.

I think the picture doesn't necessarily need the text above the gate because everyone can see the name also above the whole picture. In my opinion it would be better without the text.