As you're redesigning the site, these onservations may be redundant!
First, there is a lot of content, which is good - I mean, good that there is a lot of it, and a lot of it is good.
A beginner's guide to Watercolours is a great idea and probably worth a whole site to itself, and your photographs are even better. But then you add a section on Northamptonshire History, a section on Silverstone race track; a lot of wonderful poetry is icing on the cake.... which I think begins to collapse through the sheer richness of what's on offer! There's enough material here for three or four seperate sites.
Actually, I'd think twice about the Humour section, I, like everyone else I know, get sent dozens of funny stories and jokes and whacky photographs and Powerpoint slideshows every day, and they really start to get irritating :(
I'd like to see a really clean Front Page, with the navigation cleaned up and just a few salient pointers to the really inteseting bits from your current site. And maybe a more interactive interface, such as, for example, a step-by-step painting, gradually building from a blank canvas to a finished work of art, with annotations along the way.
The Children's Orchestra is a fascinating idea and one I shall watch as you develop it... the picture looks very like the Hoffnung Orchestra, are you sure about the copyright angle? And, to nitpick, you have the string Basses labelled as 'Cellos.
Overall, a nice site - although I originally hated the parchment-like background, a very '80s feature, it grew on me, as it is quite relevant!
It's on my Favourites list now, and I'll be re-visiting it over the next few months, so good luck with it.