These are all  drawings that  I have created using Photoshop and Sketchbook Pro. I make use of the mirror tool in Sketchbook Pro to help draw the images. I use a reference photograph to copy. I draw the basic outline and add in the main features all in black and white. I then add detail like the fur etc.  Finaly I paint on the colour, the black and white provides the highlights and shades. As you can see, I used a thinner brush to refine my technique, in the later images of the sequence they appear to look photorealistic compared to the Lion.