Hi all, just wanted to share this with those people who, like me, would have trouble visualizing certain poses and angles that you can clearly see in your head but for the life of you cannot translate it on to paper. Well, an elegant and free solution that I've found works very well is using DAZ Studio 3D. It's free to use and there are several different models you can download from here
The models are good quality and the anatomy is pretty darn accurate (though this is not meant as a substitute to learning real anatomy). I use this as an alternative to those little wooden mannequins most artists use and it works great whenever I need to visualize an angle that I know I can't do from imagination. I try not to rely on this tool too much but when I absolutely can't draw the angle I want then it's a huge help.
Another good tool for referencing inanimate objects such as vehicles, guns, and famous landmarks, etc is Google's Sketchup. It's also free and there are thousands of 3D models you can download. Here's a link to it,
In addition you can easily create a crude version of the environment for you story and use it as a basis to build upon when you draw. I just create simple blocks to represent buildings, or a bedroom, or dinner table, or what have you. I still plot out the perspective lines when I draw so that I get used to the process.
Just my two cents, these tools are meant as aids and not crutches. Those of us who aren't quite as good should use them to learn to get better, and on the rare occasion that a pro might get stumped, they're also quite useful I think.