Use inexpensive acrylic paint and stay loosley within the lines but don't worry if paint gets on the lines. When the paint is dry, use a black permanent marker to clean up the black lines. Finish with a gloss acrylic coating, applying with a large flat brush.
Step 1: Paint Fast & LooseBuy Acrylic Paint Set on Amazon
Be impressionistic. Dab colors quickly within each section and mix with your brush and water as needed.
Step 2: Clean Up Black LinesBuy Markers on Amazon
Once the paint is dry, use a black permanent marker to cover up any paint on the black lines.
Step 3: Apply Gloss VarnishBuy Gloss Varnish on Amazon
When paint is dry and black lines are cleaned up with marker, finish with a gloss acrylic varnish.