Design UI Spacing

One of the telling differences between an application design that is handled by a designer and one that is handled more by a development team is spacing. Developers don't usually think much about how element should sit on a screen together, so you see a lot of items crammed together or unevenly distributed. This is the kind of thing an average user can't put their finger on, but on a subconscious level, it bothers them and gives them a negative opinion of the application.

Inspiration: Rich Barrett