I don't see room for shutters on the lowers with the porch roof right there.

Shutters would work on the overhead porch window ONLY. Paint the attic window trim to match the others.

Rough sketch to show concept so ignore the "before" house color:

No shutters - there isn't room for them!

“…is that too little space?”

Yes.

The problem is that the shutters will have to be more narrow than they should be.

I'd select white.

Just, no.

You don't seem to have enough space for shutters. Build your wrap-around porch before deciding anything about shutters.

No shutters they will not fit in the proper size for the windows . Add the rest of the porch then see what else might be good for curb appeal You do realize a covered porch will cut down natural light in that room on the left.. Your home is nothing like the inspo pic so forget that .

You do not have room for shutters on the 4 big windows. In your inspo pic, you can see the shutters enhance the windows, but don't cover up most of the siding. Any shutters on your house will be skinny and undersized and will still cover up most of the siding. They will end up looking like stripes on your house.

I'd just be sure to paint the window trim a color that goes with the siding, instead of that bright white.

Just came across this picture of a house similar to yours with an extented porch and no shutters:

No. Even if you had room enough for shutters, the house has plenty of interest with the contrast siding, the lovely front door and millwork that shutters would be gilding the lily. If anything, IMO, lace curtains would be the perfect touch vs the slatted blinds.

No space for shutters, but perhaps some sorta window boxes?

PS ~ and a new mailbox and house numbers would update well with new side it.