I wouldn’t worry about the errors, man, CSS is a bear to make work without a little hackery.
It looks pretty good. The only comment I have about design itself is the diagonal stripes in the header really make it distracting to read the main text because of their similarity to those in the background. A fix could be to darken the background or maybe fade out some of the diagonals in the header image. Could also help to make the border along the post area darker to separate it from the background.
I REALLY like your work though. Excellent stuff, from a photographer to a “real” artist!