In my opinion we can use a unique THREAD for each category of pictures, and not different ones. It will help to focus the attencion on a single "virtual place" and enhance the competition on that.

For example:

This entry period for Week 40 will be from Monday September 29th through/including Sunday October 5th.

Images of the Week

Submit just one picture per category

Kind of picture:

Portraits -- Anything with eyes; people or animals
Landscape -- Country, town, city, sea, abstract, things (water drops, smoke, flowers, candles, and so on)

Kind of tecnique:

Blending: any picture elaborated at least with blending
HDR: any picture elaborated at least with hdr

Weekly shot: any picture taken in the last seven days!

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Instead of creating different topics for different categories, make em all in one big thread.

Maybe it will be a little chaotic, but it's all in the same place.

Another cool thing would be having a sort of "historic-hall of fame" for previous week\pictures! ^_^