Welcome, Simon.

Good first attempt - try to check the rivers again, imho they could need some adjustments in colour (maybe its the layer style you've used?!).
Perhaps pasis' tut here in the forum can offer some help with that.
It'll need its time, for sure - but by following those great tuts in here and some advice from the elders and betters, I'm pretty sure you'll make it.

>Moe