Rather than use the pool of ink in the lid of the stamp pad I have found it easier to use the cheap palettes that you can put a drop of reinker in. You can use the same drop of ink to make about 3 shades of colour and whilst it is not overly clear in the photos it is very easy to see on the cards in real life that I have several different shades of some of the colours. Its also a lot more time efficient timewise as one drop of reinker and the water from the aquapainter go a long way.
I love watercoloring but do get a bit impatient that the pool of colour runs out long before I am finishing colouring and when I do it again I end up with a slightly different shade than what I had previously coloured. The way I do it I have a lot more control over the colour and also the quantity available and the desk is less cluttered as I don't have 6 stamp pads taking up room and clean up is a breeze with a baby wipe.
Heres what I created....