Did you have to take a class on taking crappy pictures, or does that come naturally? Is there no focus on your camera?
Without decent pics, you're going to have to give some dimensions.
Also, there are better cans. There are some baby formula cans that are about 3.5" in diameter and are about 9" long. These will about double your gain. People have stated that they have built cantennas using large diameter cans (1 gallon size) and have had excellent results. However, if you look at the pattern for these larger models, the main lobe is drastically skewed off-axis.