Darren,
In answer to your questions:
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1. The pigment appears very clumpy in the pictures, so do you need to do any prep work to rectify this?
I believe the clumping occurred because the pigments are very finely ground and adhere very well - they are sticking together . All it took was to touch them with a brush to have the "clumps" break up. I believe this is more of a 'appearance' thing in the photos than a problem.
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2. Do you find the colour range available restrictive?
I note the 21 colors listed on the TankRat website and that they are adding additional colors to the line. I think at this time that they offer a broad selection of colors to choose from and additional colors are forthcoming.
I didn't mark any 'lows' as the product worked as advertised, really adheres to surfaces well, doesn't require a 'fixative' overcoat and for the amount in the container, the cost is very reasonable.
Having used a wide variety of pigments/powders over the years I found these to be among the best I've come across.
Cheers,
Charles