I have a bit of a 'love/hate' relationship with gouache. I have very strong memories of learning to use it at Uni and being so frustrated with it. I just didn't understand it, and ended up failing that series of assignments. Now all of these years on I 'get it'! Everytime I use it the smell of the paint takes me back to those frustrating classes.
The beauty of it is getting just the right mix of paint and water to create that perfect flowing feel and lovely flat colour. When it's flowing it's wonderful to use. The challenge is keeping the consistency after after hours of using it! That was my night last night, but I have finally finished all of the line art illustrations for BOOK 4 of the new series I am working on. (That leaves two to go!) I have really enjoyed getting back to hand painted artwork, but it can be tiring on the eyes to use the lightbox for so long too. I'd love to do less computer generated artwork and get back to the 'hands on' stuff. There's something special about a hand painted final artwork rather than a final piece printed from the computer - don't you think?