1. Photograph Tiger lily, capturing detail in all parts of the flower.
2. Hint at the form of the rest of the plant, but keep all other aspects of the background unobtrusive.
3. Make the perspective and balance of forms pleasing.
Here is how I went about it:
1. I chose a lens that would cover the field that I wanted to include - a mature flower, and an incipient bloom for contrast - from a nice distance, a meter or so. Not where I'd put my nose to sniff the aroma, but where you might stop to admire a fresh flower. My choice was a 135mm f/2.
2. I set the aperture wide open at f/2, to soften the background as much as possible.
3. With the camera on a tripod, I arranged my composition and focused on the part closest to the camera lens. Here is that first shot:
4. After the first exposure, I shifted the focus rearward by a very small amount, and shot another frame.
5. I repeated the process until I had an image with the focus on the most distant part of my primary subject.
6. After making basic adjustments to the first raw file (in Adobe Lightroom), I applied those settings to all 22 image files, then loaded them into Adobe Photoshop as one multi-layered document.
7. Selecting all of the layers, I used Auto-align (in the Edit menu) and then auto-blended the layers to use the sharpest, most detailed renditions of each area.
The result is a nice crisp image of the Tiger lily and its coming cousin, with a soft background that complements them.