Yeah, the yellow and black(?) lines don't really add up, that's a glaring one...
Also, it appears you've painted the mirrors orange, I think you may have messed up your layers.
Finally, I've compared it with a copy I have on my laptop and the real thing - I'm afraid you've not got the right font for the GMT logo, its supposed to be Helvetica Bold.
Fix all that, and I think this will go a long way. I've got this fixation for Greater Manchester Buses, and it'd be nice to get a proper GMT livery or two for OMSI 2.