Here’s an improved version of your job post for a 3D Modeller/Animator:
Description:

We are seeking a skilled 3D modeller/animator to create a 30-second animation showcasing the features of a product we sell. The animation quality should match the example in this YouTube video.

Details:

    We will provide a .blend file of the product (image attached).
    The animation should be visually appealing and informative, explaining the key features of the product.
    Render quality should be on par with the video linked above.

Additional Information:

    If this project is completed to a high standard, we have additional animation jobs that will be awarded to you.
    Please include in your proposal the number of hours you expect this project to take, along with relevant examples of your previous work.

We look forward to seeing your proposals!

This structure is clear and direct, helping you gather the right information to choose a suitable 3D modeller/animator.