...
Electrical requirements, such as differential pairs, filtering, and avoidance of parasitic/coupling should take precedence in layout.
However, designers must take care to preserve aesthetics in layout. Ultimately, a clean looking board is a big part of the first impression we make on design judges
Alignment tools must be used to perfectly align and space components
Design rules will default to the minimum of what is manufacturable. It is best practice to increase trace widths and clearances wherever possible. You can even increase design rules if board space allows.
Silkscreen
Designators
All designators should be shown.
...