Newbie D50 user - uploaded some pics for free if you want em

Hi all

Just thought I would post a link to some photos taken on my D50. I class them royalty free so feel free to use them for any reason.

http://www.geoffcoope.co.uk/geoffcoopephotos.html

Now, can anybody tell me the best way to take sky photo's as I'm finding this difficult, they always come out too dark or totally different to how it actually looks. Please note I'm a complete novice and haven't gone much beyond the pre-set modes.

Cheers all
Geoff
Nikon D50, 18-70 Lens