He looks great, and with how good the cab beading looks, you really ought to scrape all the edges and beading (kinda like how Flying Scotsman looked at Wembley in 1924-25) and the boiler bands would look really nice with the edges scraped to be bare metal (which is in the RWS in some illustrations)! I also think you may be able to get/make a pair of decently sized whistles that have the classic recognisable double tone.
@@davidwhiting1761 look at a photo of Flying Scotsman at Wembley in early 20s, every edge and small section/strip was polished metal, which I think would look really good on Thomas here. I've seen people make some very good sounding whistles at surprisingly small scales, and if all else fails, ones at an octave higher could be atop the boiler with ones at the right pitch hidden from view.
Why make any more changes? Thomas is very handsome the way he is. If he were mine, I wouldn't change anything, I love him as he is now. After all.... Thomas, we love you the way you are.