Well, I've been analyzing the 'webcomic' concept in itself. As I see it, it puts the following constraints:
I like the second point, being somewhat forced to update on a regular basis is definitely something I want --I'm lazy. But the third one is the actual key point, as this is intended to be a live and ongoing process, something that ideally would be followed via regular visits (perhaps through an RSS reader), you don't have the liberty to rethink what you did.
I think I'm ok with this, I think as long as you understand it, the end result can be great. One approach would be to define the story completely before drawing anything else. The other would be letting it evolve and 'define itself'. I think the story will definitely benefit if the major plot points are well define beforehand, but I also like to have the ability to tweak it along the way...
On the subject of the site itself, I'll be updating it shortly to display the comic in a more 'webcomic-like' layout. I think I'll keep the blog as it is and create a new page for the webcomic itself, with a separate RSS feed. I like also the idea of creating an iPhone-specific version as was suggested to me by a friend.
Anyway, I've been drawing some faces to train myself and also looking for the face of the main character. The more realistic ones were drawn based on photographs, and as such are probably not really suitable for main characters.