Cloud between roofs

Teething problems. Can't seem to find a place that sells water colours in tubes. Problems with the paint drying out i.e. the blue is totally uneven. Maybe I should just use colouring inks. I also bought calligraphy ink instead of indian meaning the black wasn't water resistant. So I had to use colouring pencils to colour it in. ah well on to the next. Trying not to remain positive and keep trying.