Based on the provided information, here is the comprehensive valuation of the Toyota Camry SE 2018:

1. Market Value Analysis: The average selling price for similar Toyota Camry SE models with similar mileage and condition is around $15,000. This serves as the baseline value for the valuation.

2. Vehicle History Impact: The lack of accidents or major repairs positively impacts the value of the car, as it indicates good maintenance and care.

3. Condition Impact: The very good exterior condition with minor scratches and excellent interior and mechanical condition contribute positively to the value. A well-maintained car typically commands a higher resale value.

4. Additional Features Impact: The upgraded sound system, tinted windows, and remote start system add value to the car, as they are desirable features that enhance the driving experience.

Comprehensive Valuation:

- Market Value: $15,000

- Vehicle History Impact: +$500 (positive impact due to clean history)

- Condition Impact: +$700 (positive impact due to well-maintained condition)

- Additional Features Impact: +$800 (positive impact due to desirable upgrades)

Total Valuation: $16,000

Recommendation for maximizing value:

1. Continue regular maintenance to maintain the excellent mechanical condition.

2. Address minor scratches on the bumper to improve the exterior condition further.

3. Highlight the additional features and upgrades when listing the car for sale to attract potential buyers.

Please note that actual market value may vary based on factors such as location, demand, and market fluctuations. This valuation is based on the information provided and current market trends.