Girl wearing Neon Green Light Blue White custom baseball jersey playing with water gun at home

Your description presents a scene full of vitality and summer atmosphere! The following is a refinement and creative extension of this image, which may inspire more inspiration:
Scene construction
Color collision
Jersey design: Neon Green (fluorescent green) as the main color tone, paired with Light Blue cuffs and collar, white numbers or letters embroidered and embellished, creating a high contrast visual impact.
Water gun color scheme: Choose transparent or semi transparent materials, filled with fluorescent green/light blue liquid that echoes the jersey, creating a flowing light and shadow effect during shooting.

Environmental atmosphere
Background: A sunny courtyard or balcony with light colored tiles or waterproof cloth on the ground, reflecting light to enhance color saturation.
Props: Scattered water balloons, colorful swim rings, mini inflatable swimming pool, creating a casual feeling of "water party".
Details: The girl's hair is tied in a high ponytail, with water droplets on the ends of the hair; Stepping on white sneakers, water stains splash on the edges of the shoes, adding a sense of realism.
Motion Capture
Action design: The girl kneels on one knee, holding a water gun and aiming at the camera, with a smile at the corner of her mouth and lively eyes; Or running sideways, the water column curves in the air, and the clothes sway in the wind.
Light and Shadow Effects: Backlight shooting, allowing water droplets to refract rainbow halos in the sunlight, highlighting the cool feeling of "playing with water".

Story Extension
Theme setting:
Summer Carnival: Invite friends to hold a "water gun battle" together, and the jerseys can be customized into team styles to increase interactivity.
Creative Photography: Using jersey colors as the main color tone, paired with props of the same color scheme (such as fluorescent green goggles and light blue towels), shoot a set of "color themed" portraits.
Emotional expression:
Through girls' clothing and movements, conveying unrestrained innocence and freedom, suitable for children's brand advertising or social media challenges (such as # NeonSummerChallenge).

Practical advice
Clothing material: Choose fast drying fabrics to avoid feeling heavy and uncomfortable after playing in water.
Safety reminder: The pressure of the water gun should be moderate to avoid eye injuries; The ground is slip resistant to prevent falling.
Shooting technique: Use high-speed continuous shooting to capture the moment of splashing water, and later add light spots or watercolor filters to enhance the artistic sense.
This scene is suitable for personal creation and can also be developed as inspiration for brand marketing. The core is to convey the vitality and happiness of summer through the combination of color and dynamics. If you need more specific solutions (such as jersey design drawings, storyboard scripts), you can further explore them!