Greg M. Johnson wrote:

> If  I were to insist on a portrait orientation,   is there any advice: 
> don't bother,  it'd be welcome, try it but make sure you do XYZ,  etc.? 
> 

My advice would be, assuming the judges will look at the additional 
renders (these can be added under "source"), to send an additional 
render no more than 960 pixels tall. Your image is going to be viewed at 
that height anyway, better it be viewed as a nice render instead of a 
resize. I guess if you ran out of time, you could at least submit your 
own resize, done with what you believe to be the nicest algorithm for 
your picture.

I wouldn't worry about it much. Any picture with enough details for a 
poster-sized render is going to look less than ideal at screen 
resolutions, no matter the orientation.

  -Shay