just a couple tips for the knife:
right now the metal looks very stony, probably due to all the noise you have on there, and the many normaled in bumps. metal is best defined as a smooth surface. weapons especially don't get dented and rough, as they are meant to be very strong and last a long time. instead, the coating wears off and you can add really, really cool unique specular detail to mimic that.
shiny things like blades work far better with a darker diffuse and bright(ish) spec. keep your materials smooth and really work that specular map! get some color in there! color and unique detail on the specular are both essential to sell materials.
it looks like you're making the plastic handle for it. currently you have a lot of odd mid size splotches on the specular and it's making it look rather low resolution. you can try mixing in some noise in there (mask it off in areas for instant wear) to get some fine detail, as well as some dirt caked on the indents. colorized duplicate AO works well for this.
i'm probably going to sound mean here, but it must be said. tape is a lazy way to add detail when your textures are too boring and undefined on their own. it's a cliche as much as tally marks and silly blue writing, and should be avoided whenever possible. when you have good looking materials, you don't need any of those cliches!