When looking at this there is not much that really needs some critique. I think the journal itself is very well balanced and it's easy to concentrate on the content. With the rather plain structure the focus is definitely on the content and especially when using images you have a nice "frame" to showcase them.
The colors work very well together and create a nice mood when exploring what each deviant has to tell.

On the other hand the simple layout can let it be a bit boring when people are going to write a lot of text. Even more if they maybe will use just one box. But i guess most people are decorating their journals with a lot of images, icons and emotes, so that is really something minor.

So finally there are just two things i would suggest to improve a bit.
The first thing would be the bottom. I love the way you incorporated the shells, but they could be a bit lighter. It looks too similar, too blue, too equal. Maybe work a bit on the contrast, add some highlights and let them shine a bit more to pick up the "light theme" at the top and with the shiny headlines.

Talking of headlines it leads me to my second suggestion. When looking at this preview, they are the boldest part - together with the images.
Opposite to them the journal title and the menu seem to be rather unimportant, but should be a bit more dominant, because the journal title is that what will attract your watchers and random visitors, while the menu should be easily seen as something like that. So maybe a bit more of variety when hovering over those links would be nice or any other highlight that will catch more attention.

Hope it was useful and keep up the good work

Critique courtesy of *devCRIT