Drawing Designs

I often get asked how I come up with a drawing and its not easy to answer a question like that. About as hard as when someone asks about tattoo removal reviews. I do have lots and lot of reference books and stuff I have collected from the internet but these images will give a bit of a idea. Image one is where I have done the sketch and started adding detail. Image 2 is where the sketch is put on a light box and the lines are all inked in. Image 3 is the linework all done. Image 4 is where the image has been put into photo shop and the colour rendering begins. I will add the final drawing soon.