It's important for me to look at every part of Visual Design from the UX perspective. Every Visual Design desition must be justified by improving the UX. The right UI style can never be selected just to look pretty, it needs to support the UX end even push it to another level.
It's also important for me to always make a working prototype because static screens are just the first half of the work. The second half is how all elements interact with each other during the transition, scrolling etc. All motion needs to be considered from the early stage of a design process and needs to serve its purpose.
*Please note that this website is now a bit outdated and a brand new version is on the way.