I think it´s a good idea to create some master posts to gather all the information I have about some specific topics. I will update them from time to time.Here we go with the first compilation about Photoshop drawing, I hope you will find it useful 
Vectorial drawing in Photoshop (basic)
As you can see in the picture, this is a Photoshop inking without modulated lines, using vectorial drawing tools, from a traditional drawing. You have to create the strokes with Photoshop vectorial drawing tools, and then to contour them.
Advantages:
- You don´t need a vast knowledge of Photoshop.
- It´s very quick.
- It´s very clean.
Disadvantages:
- The appearance is quite basic, althought it will look better with color.
Vectorial drawing in Photoshop (advanced)
Quite similar to the previous one, but we create fill-in areas instead of lines. It´s always good to have a pencil sketch as starting point, though it´s not essential.
Advantages:
- The inking itself has a great streght, we can use it without color.
- The result is very clean.
Disadvantages:
- It takes quite a long time.
- It´s not very funny, and a bit uncomfortable in my opinion.
Hand made drawing in Photoshop with a Wacom Cintiq
With the mouse is practically impossible draw by hand, so you´ll need a pen tablet, which isn´t perfect either but it helps a lot. If you really want to make a good profit of this method you´ll need a
Wacom Cintiq (a monitor on which you can directly draw), out of reach for most pockets.
Advantages:
- It´s challenging, very funny.
- It´s very quick when you get used to it.
- Almost as sensitive as traditional drawing, but cleaner.
Disadvantages:
- The result is not as clean as using vectorial tools.
- You have to invest in hardware: a Wacom tablet, or a Wacom Cintiq if you can afford it.
Traditional drawing and retouching in Photoshop
If you´re good with pencil and paper this will be probably the most comfortable method for you. The key is to be very clean at drawing. Afterwards, with just a few retouches in Photoshop the line will be clean and well-defined. This way we´ll get an inking effect.
Advantages:
- Nothing as accurate as traditional pencils.
- You can skip the inking, it´s the same drawing retouched to make it look like ink.
Disadvantages:
- You must be very technical at drawing.
- The final inking is never as clean as the digital one, no matter how clean you can draw.
Other supporting tutorials
These aren´t tutorials specifically about drawing, but they follow the topic, besides they are very interesting to read:
Mascot design in Photoshop tutorial for Smashing Magazine
Character design Photoshop tutorial for PSDTuts
Character design Photoshop tutorial for PSDTuts (previo pago)
Basic principles of mascot design
Vectorial illustration with Illustrator
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