Hey,
This is one of my first matte paintings, tried one or two before for fun. I wanted to do a decent rendering of a particle system (the tornado) done in Maya, brought this in Photoshop and put some sky and buildings on there. After a couple of hours painting this was the result... I have little experience in matte painting and I am not so good drawing the eye to a certain point. Composition might need some improvemnent as well.
This is the image I started from:

>> Hi resolution image <<