1. **Modeling the Shape:**
- Import the reference image into your 3D software as a background or reference plane.
- Use basic shapes like spheres or cubes to block out the main form.
- Apply a subdivision surface modifier to smooth out the geometry.
- Sculpt or adjust vertices to create a slightly irregular, soft, and rounded shape.

2. **Creating the Inflatable Look:**
- Add a cloth or soft body simulation to give the model a puffy, air-filled appearance.
- Use sculpting tools to add subtle creases and stitching lines, mimicking the seams of an inflatable object.

3. **Texturing:**
- Apply a smooth, matte material to the model.
- Use a fabric texture with a low bump map to simulate the surface of an inflatable toy.
- Adjust the material's roughness to achieve a soft, non-reflective finish.

4. **Lighting and Rendering:**
- Set up soft, diffused lighting to create gentle shadows and highlight the volume of the object.
- Use an HDRI map for realistic ambient lighting, if desired.
- Position the object on a clean, minimal background with a light gray or pale blue color.

5. **Final Touches:**
- Render the scene at a high resolution to capture all details.
- Post-process the image in software like Photoshop to enhance colors and contrast if needed.

By following these steps, you should be able to create a high-resolution 3D render that matches the description provided.