Best ways to make great photographs with iPhone 6
#1: Keep Your Lens Clean:
Every time a photograph is taken make sure the lens are wiped off. The lens of iPhone is tiny and hence needs to be maintained clean to ensure sharpness. A finger print will substantially soften the image and lower contrast. A smudge or schmutz as it is called can diffuse the image to the point of total failure and a tissue or a micro fiber could be a best choice to keep the lens smudge and scratch free.
#2: Be Touchy
The phone comes with auto-focus and auto-exposure, but it can get fooled. Compose the image first, and then tap on the subject of the photo. Once the image is focussed and exposure locked, one can then drag finger up or down to adjust exposure.
#3: Shoot Standard
The standard camera setting can be used to capture image. The standard photo is a 4:3 ratio which will give a standard image. If one may consider shooting in square mode say on using Instagram, since Instagram forces you to use square compositions. This will save time on having to crop later and perhaps missing a part of the image that you wanted in or is needed for the composition. Getting it as close to perfect in the capture, then fine tuning later in post is a great rule of thumb..
#4: Avoid Flash
Turn the flash off. Unless it is really dark, like the inside of club or outside at night , the flash (which is really a LED light and not a flash at all) will make a crappy photo. There are three settings, off, on, and auto. By default it's on auto out of the box, you will want to set that to off.
#5: Avoid Zoom
Use minimal if any zoom. Any zooming one does by pinching the image will digitally zoom it, and it's better to just do that in a post app. Use a little bit of zoom if one can't physically get closer, like a shooting a building across a busy street, but really cropping should be done in post to maintain quality. When one has 8 to 12 megapixels like the iPhone has, one can have plenty of pixels to crop in post.
#6: Use Snapseed for Editing
Use the best app Snapseed (find it free on iTunes and Google Play). Snapseed does it all. Snapseed is the best app ever invented because it's free, and it's spectacular. Google has super charged Snapseed into a beast of an app.