• A thumbnail is a small image representation of a larger image, usually intended to make it easier and faster to look at or manage a group of larger images. Graphic designers and photographers typically use this term.

• What i can give you for an high quality eye catching thumbnail:-

1. Include title text to deliver context.

2. Use the best font style.

3. Fine contrast with bright background.

4. Use a relevant and great image.

5. Include an image of the face: Make eye contact with the viewer.

6. Analyze your competitor.

7. Create a design for a small screen.

8. Optimize for different devices.

9. Using Better colour combination to attract your Viewers.

10. Export at high quality.