First of all, you have some insane texture stretching on the handle on that scorpion of yours, and adding scratches to a solid color doesn't make a good texture, it needs a lot more detail.
And on to the models, they are very basic, mostly beveled primitives seemingly, which isn't a very proper way of modeling, and the cylinders you use all have too many divisions. And you seem to model screws and such things that are completely unnecessary to model seeing as you can just texture it in. Also looking from some of your screenshots your models have been triangulated, which I wouldn't suggest doing until you're completely certain that you have completed your model, seeing as it's a lot harder to work in a triangulated mesh.
All in all they look alright, you're probably new to modeling and with that in mind they look just fine. Just for the future take all the points I've posted above in consideration and always provide wireframe shots of your model, as it helps us criticize.
Alucard94, the member of the future of the past.
