Tie Fighter - More Texturing

I have made the changes to my tie fighter that I wanted to in the last blog for texturing this model and am happy with the final result. I used a reference image to enable me to achieve the correct colour of the ship. I could not however get the texture on the wings to work, I added in a new material and chose the file I wished to import yet it had no effect on the model at all, I believe this could be down to me not fully understanding how to use files as textures. Despite this inconvenience I still feel as if the texture looks appropriate on my model.