General design
VT Grid Mag has a clean, decent appearance. The masonry structure helps to make use of space inside the web page and allows the reader to have a quick look at the content of the page. The main design is primarily based on straight lines. Moreover, the author minimizes even the unnecessary details of the design to make it extremely straightforward.
Other elements
Grey, white and black is the main default color of the demo. The body background is white to ease your eyes while reading and the white background color of header and footer separates and emphasizes these areas. They are neutral and classic color, bringing a sense of elegance and harmony.
The author uses Open Sans Condensed to highlight the title. Meanwhile, the body content font is Inconsolata, which makes the text script and clear. I think that these fonts are more suitable with a male than female blogger as they lack softness.
To concentrate on the body content, there is no sidebar on homepage and no footer columns. The header is also very clear, spacious.
Header
The masonry structure wraps all post on the archive page in a very neat way. The information about the post is well-ordered, looking symmetric. Especially, I love the way the author shows the number of comment by the icon here to express this detail briefly.
Archive page
On a single post page, there is a sidebar on the right, next to the large feature image. The sidebar also has a simple design without any decorative element like lines or dividing boxes between widgets to avoid being messy.
Sidebar
But I think that the widget like Archives should have bullet points to mark each line. It would be easier to differentiate the before and after line than the current design.
Archives in sidebar
Responsive
This theme's design is flexibly adaptive in every device. It means that this WordPress theme is displayed nicely without any mistake in devices like PC, laptop, tablet, and smartphone. You can see the example design here using ami.responsivedesign.is.
example design here using ami.responsivedesign.is