Hi Tony
It should look a lot better when its weathered in.
In the sample below I used Woodland scenics 'buff' coloured 'medium' ballast which looked hideous straight out of the container, but after it had been weathered with a single spray of 'sleeper' grime, which btw painted the rails sides, sleepers and ballast in one go, it looked a lot better (see below). The 'buff' like the 'grey' is very bright straight out of the container and contrasts too much with the plastic sleepers, but the overspray of sleeper grime on top of the lot blends it all together. I will try and dig out a photo where I used 'grey' medium ballast.
Woodland scenics medium buff ballast after the ballast, sleepers and rails over sprayed once with RailMatch sleeper grime. The overspray does a lot to blend the whole lot together removing stark contrasts.
The track in the pic above in on a 3mm track bed which would be suitable out in the country side to create a shoulder, but in the environs of railway stations not needed as it would all have been fairly flat (i.e. like photos of Omagh North). Perhaps make the ballast area just a little wider than the track in your photo.
In my case I did not pre-paint the track work, nor rails, I just over sprayed the lot in one go once the ballast/pva/water mix had dried. Before the overspray the buff looked ridiculously bright compared to the unpainted sleepers.
TIP - How I removed paint from rail surface: After over spraying the track, ballast and rails with sleeper grime (50% thinned), while it was still wet, I used my index finger tightly wrapped with a small piece of kitchen paper to run along the top of the rail and removed most of the paint just from the top of the rail, being careful not to come into contact with the top of the rail sides, sleepers nor ballast. Than about an hour or two later before the acrylic paint had cured, but was touch dry I used a cotton bud just dampened with methylated spirits to run along the top of the rail to remove any residual paint. It comes off much easier at this early stage before it has had time to fully cure.