First observations, if I may, replace those 'spline trees' with something better (as they use the old alpha-blending, hence gives that 'halo' affect, secondly, check the trackwork on that xing there (awfully wobbly trackwork) and thirdly, ditch that old chunky mesh track that is so UTC era, for something respectable (look through the built-in tracks for 2010, sure you'll find something nice there) - other than that, keep at it 
