General design
In general, the design is super simple. You can see the demo homepage has only header and body content, no sidebar or footer area.
Other elements
The default colors are white, black and orange. The black texts are used when they are put on a white background, while the white texts are on the orange background. That combinations are reasonable and easy to read.
San serif and Lato are 2 default font used in this WordPress theme. On the one hand, they are clear and easy to read, on the other hand, they look nearly assemble and quite boring.
The header area only has title, tagline and social linking bar. In my own opinion, it's too empty and unattractive.
On the homepage, the posts are shown in the masonry structure. This is the only layout for the front page. Only the title and category putting in individual boxes on the featured images to spotlight the images. This layout makes the theme well-organized and helps people concentrate on the display of the photos. And on the single post page, photos take the place more than any other elements. Again, it's a good way to boost the media display. But I think it lacks many important features for people to interact with your posts like comment, tag cloud, and social sharing.
Single post page
Responsive
The design of this theme in PC, laptop, and table is fine without any problem. But when I used this WordPress theme in my iPhone X, there comes a mistake. The box titles of the different posts stick to each other like this. And this mistake happens in other kinds of the smartphone when I tested.
Responsive design in smartphone
You can see all the responsive design using ami.responsivedesign.is.
responsive design using ami.responsivedesign.is