Create a vibrant floral composition that radiates joy and energy through the use of bold colors. Feature oversized flowers such as sunflowers, dahlias, and hibiscus, utilizing a palette of rich reds, vibrant yellows, and deep purples. Apply a digital painting technique that emphasizes expressive brush strokes and texture, giving each flower a lifelike appearance. Set the illustration against a soft pastel gradient background that enhances the vibrancy of the blooms, ensuring they stand out prominently. This composition aims to evoke a sense of exuberance and beauty, incorporating keywords: "vibrant floral composition," "oversized flowers," "rich reds," "vibrant yellows," "deep purples," "digital painting," and "soft pastel gradient" to encapsulate its essence.