As a devotee of smooth, I have a few thoughts on what's been posted.
1. Photos can make things look smoother
I think that paint sometimes _can_ look smoother in a photo. I'm not talking about Photoshop effects, just a general observation on the nature of turning a 3D object into a 2D one. I started painting with primarily online examples. Once I finally started going to cons, seeing some of those same pieces (or others by the same artists) in person, they weren't always as flawlessly smooth as they appeared in photographs. However, in those cases, the pieces usually have more life or wow factor than they did in the photo.
As another example, a recent mini I painted was painted to have a section with a rougher, more textured appearance. To my disappointment, a lot of that effect faded or disappeared altogether when I photographed it. It is also frustrating that it can also be hard to get an accurate photo of minor paint issues that make paint look not very smooth to post and get feedback for possible solutions!
2. But you can achieve a pretty smooth result in the hand and under magnification
As I mentioned, I am a devotee of smooth. I strived for that in part because I didn't realize that not every mini was as perfectly smooth as it appeared in a photo! If there is one consistent comment that people make about my work, including on viewing it in person, it’s about how smooth it is. I paint under magnification, with the goal of achieving a smooth result under magnification and in large photographs. If I can post it directly onto the site (I don’t have Photobucket or anything), I would be happy to post a pic or two at full size out of the camera, pre-Photoshop.
I don’t claim everything I do is perfectly smooth and never a brushstroke nor dodgy blend to be seen. And there’s a lot of other stuff I’m not especially good at. And a lot of painters who are much better than I am. I’m just trying to say I think a fairly high quality of smoothness is obtainable without photo tricks.
3. ‘Cheating’ on smoothness or anything else isn’t the only reason to use Photoshop
I don’t know why everyone uses Photoshop, or how. I do know that for myself, and for other painters I’ve talked to, what we’re trying to do is get the damn picture to look LIKE the mini, not better than the mini. For me, that’s primarily a problem with colour correcting.
Minis DON’T look the same in person as online, and that’s far from only about how smooth they appear. One of my biggest regrets of my painting career is not buying a mini or three from people I admired in my early days of painting so I would have the real deal rather than just photos to study.
But as far as photos go, there was an interesting thread a few years ago where people of a variety of skill levels posted close-ups of their work. Some of the pictures no longer display (mine are gone, not sure why), but enough still do that’s it’s worth a look.
http://www.coolminiornot.com/forums/showthread.php?t=19141