I too would welcome any tips as I'm a complete newcomer to digital art - in fact it's this forum that has got me drawing again after years!

I've just got myself a Wacom bamboo and am trying to get my head around painting with my (not totally legit) copy of photoshop 6.0 (no Help menu, but 'Photoshop for Dummies' is helping!)
You can see my first (abandoned) attempt, and my first completed painting in this month's art comp. (
November art comp -show us your arts The 'Nighthawks' pic used 7 layers altogether. (main blocks of background colour, background details, main features, text and various effects) The diner window is a simple shape of very pale blue at 25% opacity. I began with a copy of Hopper's original, so i could see what it should look like and sample colours from it; and on layer 2, another copy at 50% transparency - enough to see the outline but faint so that my own paints ( on layers 3+) are easilly visible.These first two layers were deleted at the end, leaving just my own paints.
The great thing about layers is that everything you wish to try, but are unsure how it'll work out, can be done on a separate layer, and if it's total pants, it's easy to erase it and try again without ruining hours of earlier work.
I think that for original pics, I too will sketch in pencil and then scan this in to draw/paint over - I haven't got the hang of freehand drawing on the tablet just yet. It's kind of overhwelming that I've now got tools and software that allow me to potentially create just about ANYTHING, without having the talent to actually do it justice. How long till we invent bio-chips with Tharg sanctioned art-droid abilities programmed in?