Hi there...
You might like to try the undernoted link. Once you get there, choose World War II, and category 'Other'. Then scroll down the list on the left side of the screen until you come to Siebel Si.202 There are only a couple for this machine, and some of the colour plates on this site can be a little rough round the edges, but these two look good. Loads of other categories and profile/colour drawings etc for other types of aircraft from all nationalities. Some of the captions are in foreign languages but that can be a challenge too, sometimes. Hope this is useful to you...
http://wp.scn.ru