Your Favourite Photoshop Tutorials in One Place
Making a Nice Dog Portrait
Under Drawing Effect, Photoshop Tutorial
If you think that traditional painting is too slow for making a portrait, here is an alternative method. You can prepare an image about your object, then you selectively hide your image part by part and use Photoshop brushes to carry out.
Drawing a soldier is like drawing other characters which needs to be initiated from drafting. Once you finished your draft, you can start painting and start to set up your brushes. Different designers would have different skills you can refer.