As you look at this scene, your eyes are drawn to the large central petunia flowers that fill the wooden planter box. These flowers have wide, open petals that are perfect for experimenting with bright shades. Surrounding the blooms are various leaves and long, curling vines that drape down toward the brick wall at the bottom. In the background, the window frame and vertical panes suggest a cozy home just inside. The window sill provides a flat, solid base for the garden box, while the individual bricks below offer a repetitive pattern that is very satisfying to fill in.

To make the petunia flowers look realistic, try using a darker shade near the center of the bloom and a lighter shade toward the edges of the petals. For the wooden planter box, using horizontal strokes can help mimic the natural grain of the wood. You can make the brick wall look more interesting by using a mix of earthy tones like terracotta, tan, and even a little bit of grey rather than just one solid color. Since the leaves and vines are layered, using different shades of green will help distinguish each individual plant part and add depth to your artwork.