Basically, if you put images in a line, it could stretch the screen for those who have a smaller resolution, or drop the images onto a different line. My current display is 1920x1080, but someone with say... the primitive 800x600 or slightly more would hate you for making long width threads/posts. So it's a variable that depends on the size of a person's screen.
All I could suggest is that you use CSS, set a fixed width (say 720px), and have each image next to one another. That way pretty much every resolution would display them side to side. But other than that you're looking at various lines of images, or stretching the page. Neither of which are too favourable.
You could also experiment with the [cimg="width: 60%;"]url her[/cimg] tag, varying the width to your desire. If you do this, you can test our how it may look by resizing your browser window. That tag resizes images based on the window size. So that may be a viable option! Again, there's more than one way to do it, and more than a few variables, so play around and see what you can come up with :]
