Excellent weathering. Subtle enough to prove she has been in service, yet far from the overdone we see too often.
Three words: You. Nailed. It. Looks simply 'Grande! Not to hijack your thread, I feel the comparison is worthwhile, as it looks stunning. Here's her operating sister, the 463 in Antonito in 2017:
The one thing I can see that's wrong with Graff's version is the missing visor over the headlight and backup light !!!!! Hey Graff, get your act together !!
Honestly, I think it's well-done myself. Takes an awful lot of time, talent and patience to come up with a great model of a prototype steam locomotive, much less a slim-gauge engine, and I am impressed. Nicely done, sir, nicely done!
https://ngtrainpics.photoshelter.com/image/I0000p1kxMU_VExw And when compared to a pic of the real thing, it looks even better. BTW, photo by Gerald. M. Best, from the Friends of the Cumbres and Toltec Scenic RR site.