You should be!
my only 2 realistics up on these forums so far are my grass and rose and yup they are 100% PDN, a couple of people have had the pdn but ive lsot it now 'cause my dad decided to 'clean up' the pc :?. Since then ive been doing all my work on my laptop so i should have a pdn for everything .
All i do is sketch on paper where i want things then use the pen/line tools to draw my sketch (i dont have one of those palet things), then colour colour colour