For a beginner this isn't bad but I've seen better things from other beginning users. You've used the basic object which isn't bad and since it looks like you got the hang of those abit, try making more complex objects like a very simple handgun. Basicly, you can make it out of simple objects too but you need to combine them, extrude them,... there are alot of options so giving them a small amount of detail is you next objective, good luck

Cheers
Frazzle