The card opens on a white background with a watercolor arrangement of roses and peonies painted in coral-pink, soft-yellow, and lavender. The blooms are loosely grouped around a hand-lettered "Happy Birthday" script in the center, with sage-green leaves and peach accents filling the gaps between flowers. Nothing is symmetrical — the brushwork has the kind of slight bleed and bloom you see in actual watercolor on paper. The overall impression is quiet and light, the kind of design that doesn't shout but still reads clearly as something made with care rather than assembled from a clip-art library.
This card works well for your aunt who tends her own garden and would recognize a peony from a rose without being told — she'll notice the painting style before she reads the message. Send it with two or three photos from the last family get-together and she has something to keep. It also fits your coworker who is turning 30 and has been decorating her apartment in that same soft, muted palette of dusty pinks and greens — she'll open this on her phone during her lunch break and it will feel considered rather than last-minute. Both these people respond to things that look handmade.
The coral-pink and soft-yellow in the flowers work best with photos that have natural or warm light — a shot taken outside on an overcast afternoon, a candlelit dinner photo, or a phone snapshot from a morning walk. Avoid heavily filtered or high-contrast images, which will look jarring next to the watercolor palette. A close-up of her with a coffee mug, or a group photo from her last birthday dinner, would sit comfortably alongside the design. Recipients can tap any photo in the card to download it at full original resolution, so the photos you include aren't just decoration — they leave with the card.