That is indeed a really nice photo! The colours are awesome and I like the composition. A few tiny little things however... It appears slightly soft, and the brightest part of the sky appears to be clipped at the highlights. Whilst this isn't against any "rules" persay, it is a little distracting. My advice would be to use a 2 or a 3 stop ND Grad. This will act to keep the foreground exposure the same but bring the sky back down slightly and reveal colour in the brightest area. If you don't have any of these filters already, the Cokin P system can be bought quite cheap, with the adapter and filter holder on ebay for a few quid each. The filters are about £15 each though iirc.
Don't get me wrong however, this is a cracking photo! With the slightest of improvement, you got a real winner here!