These look fabulous to me Shiela, as Joe said white balance is reason for the orange tint. (I have not tried night photography - have enough problems when its sunny) How did you arrive at your exposure time for these?

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html