The looming green mass in the distance seems to be under attack by the small, dark figures scattered around it. The green mass is composed of varied shades - from light to dark - creating a sense of depth and complexity. As you imagine your colour palette, you could choose to emphasise the shape of the green mass, drawing attention to its movement and contrasting hues. You could use bright or muted colours depending on the contrast you'd like to achieve. You could also consider adding darker shades to highlight the figures attacking the green mass and draw attention to their presence. Finally, you could also add a few additional pops of colour to draw the eye as you let your imagination take you away.