### Step 1: Identify the Resonance Structures
The given resonance structures are two forms of a molecule with different placements of electrons and charges.
### Step 2: Determine the Major and Minor Contributors
- The first structure has a neutral nitrogen and a double bond between carbon and oxygen.
- The second structure has a negative charge on oxygen and a positive charge on nitrogen.
The first structure is more stable because it has no formal charges, making it the major contributor. The second structure, with formal charges, is less stable and thus the minor contributor.
### Step 3: Draw Another Valid Resonance Structure
To draw another valid resonance structure, we can move the lone pair of electrons on the nitrogen to form a double bond with the carbon, and move the double bond electrons between carbon and oxygen to the oxygen atom, creating a negative charge on oxygen and a positive charge on nitrogen.
### Final Answer
- Major Contributor: First structure (neutral nitrogen, double bond C=O)
- Minor Contributor: Second structure (negative charge on oxygen, positive charge on nitrogen)
- Another valid resonance structure:
![Resonance Structure](https://i.imgur.com/3Q8Z5kG.png)