Jabu,
I have tried in learn more about the camouflage paint schemes on Chinese AFVs of World War II, but was not overly successful. Two of the colored drawings provided in your last posting suggest that the garish camouflage patterns from World War I and lasting in some countries into the mid-1930s adorned at least two of the tank types purchased by China, namely the Vickers Light Amphibious Tank (Drawing No. 1) and the Vickers 6-Ton Tank, Variant F, which includes the rearward turret extension for a wireless set (Drawing No. 3). The Vickers 6-Ton Tanks acquired by Poland also had this old-fashioned paint scheme during the mid-1930s. The Pzkfw I, Ausf A (Drawing No. 4) reveals the more natural vehicle and aircraft camouflage scheme used by several nations during WWII, although perhaps significantly,
http://mailer.fsu.edu/~akirk/tanks/china/china.html
indicates that the Chinese sunburst marking was painted right onto the German production grey not long after the receipt of these light tanks. Of course, that hardly precludes these German-origin AFVs later being given a camouflage paint job.
For several examples of this older camouflage paint scheme still in use on tanks and other AFVs, particular in French and Polish service, see Peter Chamberlain & Chris Ellis's 1972 PICTORIAL HISTORY OF TANKS OF THE WORLD 1915-45.
Nelson