The vehicle featured is China Motor Bus' ML1, when it was new in 1981 (http://www.chinamotorbus.com/bus/jumbo/photo_details.php?photo=8116&search=exact).
(http://farm9.staticflickr.com/8402/8701201748_2865a2a4b0_m.jpg) (https://docs.google.com/file/d/0ByaG6ZNl3DwOM2hwU3BGcC1FQjA/edit?usp=sharing)
This is my second creation. I am still trying to improve my drawing skills.
All details seem to be here, though there are usual beginner drawbacks :
_ Southern and eastern sides of your bus are identically lit. Sun is at South in Simutrans so you have to make southern side brighter.
_ Try to make some antialiasing : make straight lines smoother (see that (http://www.simutrans-france.fr.nf/doku.php?id=en:tutomakeobj2#anti-aliasing)).
I thought about doing that. However, that means the windows will not be lit at night. I am not sure which I should pursue.
Only edges of windows wouldn't be lit at night.