Firstly apologies for the inooooooooordinate delay in the tutorial. Will not bother to give excuses, but i have to mention that i was planning to do one on a Rose and started it off too. However i got so engrossed in it, i forgot to take snaps as i went along! So here is another one. I am sorry if its too complicated, i began thinking its pretty simple, but it did take some time and wasnt that easy. If this is too hard to follow, i will do yet another tutorial with just a single flower or so..

Pencil outline of a plate of green grapes, size would be about 7"x9"
The light source is from the right side, so the grapes will be lighter on that side with a shadow on the opposite.

The most important thing about colored pencils (as in watercolors) is to plan what the lightest color is and leave that space out, for example for that small dot of white shine, leave the area blank right from the first layer.
The next light shade in the grape here is a faded green (called 'pale sage' in Prismacolors) and i have shaded the grapes very lightly WITHOUT using any pressure. The texture will be grainy.
Note that the area where the light falls has been left whitish.

First color shading completed.
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Colored pencil effects are achieved through applying various layers of colors.
For the next layer, i have used a color brighter than the last one, and its called 'chartreuse'
Just shaded the same areas as in the previous step with only as much pressure on the pencil.
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Second layer completed.
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Now i used 'apple green' to shade the darker areas of the grapes.
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The next step is to shade the shadow or darker areas of the grapes with yet another green color, I have used 'olive green' (only on the darker areas, for example between two grapes)
Now that almost 4 layers are done, i used the white pencil to press down with a little pressure in even circular strokes to smoothen out the grains or burnish the layers. ( this means the color settles into the tooth of the paper to give an even finish, not all subjects are burnished, some look fantastic with the rough grainy look, sometimes the entire painting is left that way)
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Grapes often have a yellowish glow, to achieve that, i have lightly run the 'canary yellow' pencil all over the grapes, except for the whitish areas.
I have also started the stalk with 'dark umber'
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The plate is done with three colors, 'ultramarine', 'electric blue' and black for the edges.
The first layer for the plate begins with a light shade of electric blue. ( i have left the shadows below the grapes for later)
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The shadows on the plate are with 'ultramrine'
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I have used white again to burnish the layers on the plate, its smoother now.
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The first layer for the shadow of the grapes is 'warm grey', topped off with a light layer of black.
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Finally the shadow of the plate and the two grapes outside with imperial violet and the same electric blue as for the plate,
both very light and then burnished.
I have erased two glass buttons that had been drawn in the initial drawing and some light folds of cloth below the plate as the camera is out of battery:( and i wanted to post this right now:P
Feedback welcome.