you will need your line , flat colors and a bg in separated layers.
the first step is to you to create a shadow layer between the line and flats . and set it to an opacity or fill to 35%. and you will use pure black for the painting.
capture the selection of the flat to use on the shadow layer. ( select/load selection)
to paint the shadows you need to understand the volumes of the object you are panting and set a direction of the main light source. try to locate the round and flat areas of the object , and how the light will cast shadows over it .
the shadows can be of two types. 1- the natural shadow volume that every part has . they are always soft , and for that you can use a soft brush. 2- the projected shadow from one object over another . they are mainly hard , so you can use a hard brush here, or a soft brush with a small size .
after you are done with the shadows , you can set the opacity to zero , and get the selection of this shadow layer, to use on the next step. ( select/load selection)
the second step is to paint the definitive shadow . you need to understand that shadows are not always black. shadows are darker versions of the base color . so , over your flat color , using the selection of the shadow layer , you will use the burn tool , with any solid brush. that will provide you a nice colored shadow to your object.
its very important that you make just one pass with your pen tablet or mouse . if you let go of them and make another paint stroke , you will have double effect that we dont want .
third step , is to get back a little of the shadow layer you had set opacity to zero .
try to play a little with some values . you will see your burned painted areas , changing the values of dark.
its a good idea to keep a copy of the flat colors , in case you make some mistake when painting the burn areas.
well , I believe it would be more simple showing the process than trying to explain it ( specially with my weak english)
Hey thx for the link gunna use it in my current project also if there is lighting tutorial that would be nice (not so much about how light hits a object but how you apply it to an image, if its like this tutorial but opposite Example: add white to a layer reduce its opacity select it and dodge then add highlights, then just send me a message, thx again for your time XD)
OK I get it. There is no real "secret" to the shadows, you just have to understand the correct lighting and how shadows (and I assume highlights) SHOULD naturally fall on your figure. I was hoping for some magic bullet technique that would make drawing these much faster. I guess the real secret is practice.