I'd pick the last shed dormer if I had money to blow, but I'm not sure that's what your home needs. Here is a Garrison with charming details that could be adapted for your home. I would spend the money on some windows instead.

This seems headed in a muddle direction. Don't you already have a place to stand out of the rain under the overhanging second floor?

I could maybe see #2 (with less stone at the base of the pillars), but i'm not sure any of them is really an improvement. (and yes, I think a peaked portico will draw attention to the asymmetry above!)

I think it will only look clumsy and awkward give the upper floor’s overhang. If giving presence to the front door us what you seek, landscaping and paint (on the door) are your friends.