Use the knives in your reviews, don't just have them set up looking pretty on a desk. Show them in use during every day tasks though. I don't need to see a knife chopping through copper piping, I do need to see a knife zip through a dozen pieces of cardboard and then cut through two dozen plastic packing straps.
Covering key points like measurements and weight as well as what the materials of the knife are. If it is folding knife review then all the features of the knife need to be explained, such as locking mechanism and how solid the lock up is before and after use, clip orientation, whether or not there are liners, is there flex or give to the handle during certain cutting tasks, were there hot spots on the handle, does the lock stick after heavy cutting, what kind of blade grind the knife has, etc., etc.
The same goes for fixed blades, but without as much fuss. Included sheaths are very important so that would be a focus during part of any fixed blade review. Blade grind is also very important in a fixed blade review.
Overall, doing this all in a succinct manner without getting bogged down in your personal stories is important, at least to me. I want a review about the knife and what to expect from it during use. That's all.