Great to see a shot of HRH DoG in sunshine ! I am afraid it does not look sharp enough to me.
Personally I would re crop to lose some of the redundant grass bottom left and cut out the last plain carriage to keep all the 'Blood and custards'. By the rule of thirds I would have the right hand third going through the name plate and the upper third at the level of the base of the funnel
Using Photoshop I would also tweak the sharpness, ( although I fear it may not compensate enough) using the method taught me for Glamour Photography. Email me for details if you are interested. John
I suspect the sharpness is to with DA. I cropped the photo slightly, so it isn't a standard size. It sharpens when you download the full size image.
Point taken about the coaches, it would look better with a uniform rake of blood and custard Mk1s. However, that isn't historically accurate for the loco's livery, and I'm sure someone would pick up on that
I think the composition of the photo is good and the way you have managed to get all the cream/red carriages into the photo without cutting any off works well when you consider the plain red carriage at the end. It's a pity there were no clouds about as I feel a cloudless sky lessens the impact a little.