A guy finds his look within himself, his knowledge is all he has to work with, the older a person gets and the more knowledge he collects adds up and in time his look pops right out. As tug suggested google searches I will go a step further and also add history books. If sheaths are your passion then learn all you can about them, their history is thousands of years in the making covering every conceivable society and culture and in every shape of weaponry imaginable with every type of leather imaginable. For example your sheaths and knives are very Scandinavian in design and appearance to me. You will then be able to realize a sheath style for a typical knife shape. You can then be able to further enhance that design to your liking. Then as you make what you like to make the way you want to make it, it will be your look.