I'm not going to do an in detailed tutorial for this because it has too many steps.
Obviously I started with my base coat. I then sponged on a gradient of blue yellow and green. I gently sponged on some wispy white clouds. I then brushed on some yellow and green strokes on to the grass area. I painted on a tree. Then I painted on the cow. I sealed it all in with a top coat.
All of it was done with nail varnish. It was quite messy so I had to tidy it up at the end with a cotton bud in nail polish remover.