it often takes me as long as 3 weeks to get an image done exactly the way I want to, and I have been doing it for awhile now. A good picture with no flaws means you have to step away and judge your work as if it were someone elses, and then be an absolute perfectionist. I fact, i often times try to completely rip myself apart on an image. I dont see anything good about it, I'm looking for ANYTHING wrong to say , nope , thats garbage, try again. Eventually you may be able to put together renders in no time using a lot of free stuff and marketplace items, but to put together a true image that you can call all your own, that anyone else can look at and be impressed, 5 hours is a small time indeed my friend. Dont get discouraged, art isnt meant to be rushed. Your doing fine. The fact that your still trying shows that you are on the right path.