A 3D Pixar-style cartoon illustration of a young brother surprising his sister with a gift against a soft pastel-cream studio backdrop. 

To keep the artwork completely unique:

1. In the center stands a miniature vintage turquoise-blue electric bicycle featuring a front wicker basket filled with fresh flowers and tied with a red ribbon bow.

2. The brother kneels on one knee beside the bicycle, gesturing proudly towards it with a warm smile.

3. The sister stands on the right, resting her hands over her heart with a surprised, overjoyed expression.

4. They wear matching casual outfits: bright mustard-yellow crewneck sweaters, charcoal-gray jogger trousers, and white sneakers.

Top-center features calligraphic script typography reading "Bahan • Bhai" in deep navy blue with small drawn hearts. Soft 3D studio lighting, smooth animation render, 8k resolution. [Reference Image Rule: If I upload a photo (brother and sister or kids), preserve our exact facial features, skin tone, eye shape, and facial structure from my uploaded image while converting us into these 3D cartoon sibling characters with this custom bicycle gifting scene. If no photo is uploaded, generate the full scene directly.] --ar 9:16