There's no doubt that good photos make better impressions than low-contrasted, grainy and odd-angled phone shots. I use my phone a lot, too, for "sketching" up outfits, for documenting and so on, but if I really want to see the colors and textures properly, I bring out my DSLR and the tripod. The pictures I've posted here lately have mostly been taken that way. Before YLF I never took photos of myself, but now I find it easier to like photos taken of me by me than by others. Besides, I do feel bothered by asking my family to do this for me, as far as I know they are not aware of the full extent of my involvement in developing my wardrobe, and that's how I like it. Less explanations needed:)
When I'm shooting with my phone into the mirror, I always end up looking strange: Short legs, wide hips, funny face. Worse: Proportions that are disturbed won't give a true impression of an outfit. Colors that are grayed because of lack of light won't be perceived as well by the viewer, and texture gets lost. So - I do feel that a phone capture is way better than nothing, but if there is time for a proper photo shoot, then go for it.
Of course, not everybody have the time or equipment to take better photos, in daylight, outdoors. Then we just have to make do. A camera on the phone can be very good indeed, and some of you seem to master the art of taking pretty good phone shots. LEarn from them, ask how they do it!
A few ideas for improvement: Keep the angle a little low (not too much). Try to stand near a large window, and don't use flash. If you use a camera, turn up the ISO instead to compensate for bad light conditions. If you can use it with a tripod, then do that.
Fool around a little, it is more fun, you will look better (like Shiny said), and after a while, you will be more relaxed in front of the camera. There's no need for smiles constantly. I have relatives who have the same "photo-face" in every.single.picture I have of them. That's boring.
Bad photos don't make bad outfits, but they surely ruin the impression sometimes.