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I am trying to learn to paint digitally, I received Corel Painter at Christmas, but find the transition difficult. Nevertheless the principle ought to remain the same.

Better that you started with traditional methods.

If you like to have the same feel as traditional paintaing, I'd suggest ArtRage

If you want to go crazy on programmable paintbrushes, I'd suggest BlackInk - it's very interesting!

Thanks I will look into that.