HM3: Export options

I'm currently working on adding options for how you want to export your character image, and this is the dialog box I have so far:

How do those sizes grab you? The 200x300 size I figure will mostly be used for portrait views, so you can have a handy image for using as a forum avatar, for instance. Should I have something similar intended for widescreen use? What size would that be?

Note that I am not 100% sure I can actually do all of this, especially exporting as portrait and widescreen, but I figure it's better to start out aiming for the stars.