I think I would have to strip the doors, make sure the wood is in excellent shape, wood fill any gaps in the joints, and see what variegated or tone, the wood grain is. It may be that leaving a light to medium wood grain show thru and just sealing them with tung oil layers, if not a tinted sealant/varnish, would make them the prettiest given the dark ceiling, the dark finish to come, floors and the large oval windows. I would be excited to see how pretty their woodgrain may be...Lovely doors. IF the wood grain is nothing you care for, than it would be hard to not paint them a soft blue color such as this...it goes very well with Alabaster White, your trim.... Harbor Haze(BJ) with a Sherwin Williams paint variety for wood: (Satin or Semigloss, match the sheen of your woodwork, tho even a semigloss with satin trim would be fine on doors), (two coats) over SW recommended primer after the doors are stripped, IF you do not like the woodgrain.

Consider painting your garage doors the same color as your siding. I like teal or turquoise with tan: Navy would look very classic: Red is also a nice choice with tan It is hard to tell from the picture if you have a patio/terrace in front of the lone window between the garage doors and the front door or not. If you do add a black bench with pillows that are the same color as the front door. If you do not have a terrace there, consider adding one with some plants in pots for more color and fun. No to shutters, the house already has a lot going on.

The yellow is pretty. Another option that works well with the gray and black is a raspberry color like SW Cerise. A dusty plum can be pretty as well. This is SW Plum Dandy.

It seems the challenge is choosing a color that will pull more focus to the door. Right now the white garage door and white trim are pulling more focus to me than the door. That being said, Inkwell might be a good fit with your siding and roof (charcoal?) colors. Is the siding the dark-ish gray/green color it looks like on my screen?