Hi, Here's how I painted monochrome portrait of Charlize Theron. Tools and materials: Airbrush: Iwata Custom Micron C+ E'tac transparent Sepia Photo paper for large format printing cut down to A3 size Staedtler ereaser and electric Ereaser Freehand shields Photo 1 First I transfer the image to the painted surface using a HB pencil. I'm trying to make outlines as light as possible to lose them later under the layers of paint. What you see in the picture is tweaked up a bit with photoshop levels to show you the sketch lines. Photo 2 I start painting from the darkest parts of the image. I choose an area that in the shadow behind left hand for Charlize. It is quite easy part of the image, allowing me to warm up before going to more complicated areas. Pressure is about 2 bars. The paint is pretty much diluted (proportion is about 4:1). I start gently and slowly, layer after layer, gradually building up to the desired value. When I feel confident enough I move on to painting the lips. From the beginning I use freehand shields in areas where I need strong cutoff line. I use them for the lips and teeth. At this stage, I do everything gently to leave myself room for full coverage of colour. You have to remember that E'tac Sepia is transparent color and it is is the only color that I'm going to use. I'm not going to use white colour at all. With transparents it's easy to darken up the colour but you have to be very carefull not to overshoot it. When it happens or you want to make colour brighter you have to erease it. Photo 3 I go the eyes and nose. I throw a shadow on her cheeks. The whole is slowly starting to gain contrast, especially on her left eye. From the beginning, I try to take care of the detail bearing in mind the principle "general forms first, details later". In my opinion, the image should appear on the painted surface such as photo paper submerged in developer. Similarly we should build our images. I pick up an eraser and erase wrinkles on the lips, higlights of the upper lip and in the eye. Photo 4 I go to the right eye of Charlize. I deepen the value on the lower lip and its texture. I deepen the shadows on the cheeks and paint the cast shadow of the hair. To achieve a sharp line between the face and the hair I use freehand shield. All the time I'm using the same mix of paint (sometimes diluting it a bit, or vice versa depending whether I'm painting dark or the light areas). I switch to hair. I treat hair as a whole, like it was sculpted in the stone. Than, when the general lights and darks are established I go to details and erease single knots of hairs. I add the shadow on the hands. At this stage, the image begins to look prommising. Of course, there are still many deficiencies and lacks of details. Photo 5 and 6 The next step is detailing and deepening the values to achieve desired contrast. I put a layer of paint, and then I'm ereasing, layer of paint, than ereasing until I reach a satisfactory result. You should be especially careful of the brightest parts of the image. It is easy to overshoot the values there. The return to the initial situation can be difficult and sometimes even impossible, but that's just charm of transparent paints. At the very end I erease single blond hair on the face. To achieve fine lines I cut the ereaser with knife and use sharp edge. It's also possible to get simmilar result with electric ereaser. And here are all steps together for a quick view: Hope this step by step will be helpful. If any questions show up feel free to ask!