Here's a pumpkin, starting with the stem. We're only drawing outer contours and prominent lines. If you can see outlines, you can draw this. If you are drawing from a real pumpkin, try closing one eye to see the contours (this eliminates your depth perception and flattens the image). This is the Uniball Vision Elite (who names these pens?).
The contour drawing is finished. Now, use or imagine a light source.
Begin painting with water.
You can use a regular pointed brush dipped in water or
a small Niji Water Brush, shown.
Start shading the stem, since this will be darkest and you can
pick up some extra ink on the brush to use elsewhere.
Using the brush, you can add more nuanced shading.
If you feel like you want more ink, take the pen and color a small patch (I'm trying to resist a pumpkin patch joke here) on scrap paper, touch the brush in it a few times to pick up the ink, and continue with your picture.
To finish: shade under the pumpkin, so it doesn't look like it is floating.
It isn't so obvious in the photos, but
the black Pilot pen color is cooler, more blue-black;
the Uniball is warmer, more brown-black.
Then there is fine blue, which bleeds quite a bit.
It might work better if the drawing was larger.
Sorry, pumpkin, not your color!
Also found extra fine green, red, and purple;
they, like me, stay pretty close to home.
Thanks to Tim for introducing me to this technique!