Image Registration 2D

I am trying to develop skills with image registration for a project. I am using two test images of the front of a car taken at different times from slightly different positions, so that there will be translation, skew, shear and luminosity variance. I am starting with images which should be fairly easily registered but am not getting the results I would have expected. The transformation function I am using is CP2tform and have experimented with 'affine', and 'picecewise 'linear'. 
Assistance would be appreciatated, I am quite happy to share code and imagesamples.

[Sean de Wolski]

Please share code and image samples!

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers