An invisible matte painting is one where it looks just like reality - no Hudson River school stuff, nothing overly dramatic, just an attempt to recreate reality.

Takachiho-jo (Takachiho Castle)

Note: There is no Takachiho-jo in real life. Takachiho is the name of the town about 45km from Nobeoka where the background for this painting was shot. The castle is Shuri-jo in Okinawa.

If you're curious about the source plate, here it is:
Source plate

Ok, since it worked well, and gave me an ego boost, and 'cause it's dead slow here at work today, here's a second invisible matte painting based off my pictures from Okinawa.

Cliffside Temple

Here's the source:

Source picture

These are really too easy to do. It is kinda like applying the photoshop skills I learned with fashion models to terrain instead of faces. Still, the end result looks about 1000% better than my paintings ;)