There are two categories established in the contest: remodeling and photography, with 6 winners from each category.
"Technique"/Remodeling Division
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"Mr. Tanaka" Award - Dressed up HoiHoi-san
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"Dengeki Hobby Magazine" Award - HoiHoi-san Medical Care Ver.
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"Kotobukiya Planning Division" Award - HoiHoi-san Close Combat Type Waitress Ver.
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"Kotobukiya Prototyping Division" Award - HoiHoi-san Chinese Warrior Ver.
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"Hayamimi 85" Award - Cheshire Cat
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"Kotobukiya Staff" Award - Lost of combat will! Dara-dara Lazy
Photo/"HoiHoi-san in my home" Division
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"Mr. Tanaka" Award - "Victory"
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"Dengeki Black Maoh Magazine" Award - "HoiHoi-san Alice Ver."
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"Kotobukiya Planning Division" Award - "HoiHoi-san Roll Out"
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"Kotobukiya Prototyping Division" Award - "For the tomorrow of this house"
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"Kotobukiya Staff" Award - "Putting things in order"
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"Hayamimi 85" Award - "今日のいちげき" (?)
All the 12 winning work can be seen in a new magazine published by Dengeki Hobby, not sure what's the title though.
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They will also be on display at Kotobukiya Radio Hall 2F in Akibahara from yesterday (May 1st) till May 9th.
Images are from Kotobukiya Blog and Kotobukiya Hayamimi Blog: Link 1, Link 2.