I don't paint as often as I colour with pencils but I do it on a regular basis.
I love taking my little aquarel set with me when I'm on vacation and sketch and paint a little after finding little treasures in nature.
Cotman paint is available in both small pans and tubes.
I bought tubes but pans work very well too.
I always start with a sketch. I use a 2H graphite pencil for sketching.
Then I mix the paints to get the right colours and then I use very little paint to colour the sketch.
Most of the time I use a very small red sable brush and a small filbert brush. I have larger brushes but I like the little ones more.
A couple of years ago I also started to paint my nieces and nephews with watercolour paint. My parents now have a small painting of every grand-child in their home.
I'm planning on making a video about painting children's portraits like these ones. It is not that difficult and I think with a little video as a tutorial you can do it too!
My favourite watercolour paper is Hahnemühle Quattro. The paper has a fine structure that I just absolutely love! It is quite expensive, though. But I don't care, the paper is such a joy to paint on!
I also have other types of very nice paper but the Hahnemühle series really stand out.