In addition to this list, you absolutely need feedback from someone who's honest. I know some designers (and live with one), and they always want opinions on their latest work.
In the limited design work I've done, I've found it extremely helpful to look at the subject's face when they see your design. You want to see their gut reaction: you'll see displeasure in their eyes long before they'll verbalize it. You can break the social tension around criticism by saying, "Oh, I see there's something you don't like. Where are you looking right now?"
You want feedback to be a conversation - if your subject knows what you intended, they can give you hints on what you actually wanted to design.
In the limited design work I've done, I've found it extremely helpful to look at the subject's face when they see your design. You want to see their gut reaction: you'll see displeasure in their eyes long before they'll verbalize it. You can break the social tension around criticism by saying, "Oh, I see there's something you don't like. Where are you looking right now?"
You want feedback to be a conversation - if your subject knows what you intended, they can give you hints on what you actually wanted to design.