My advice to help make a ranch charming is to make the windows taller in almost every case and then choose either double or triple single hung windows mulled together. Order grids / muntins for the top half (standard colonial style) but not the bottom to get a custom look.

This will add a lot of cottage charm. Here, white is going to be the most flexible inside - you don't have a tile roof or stucco or any of the things that really are bad with white - white is crisp and clean - your gutters are white and your garage doors are white - stick with that.

I would make them taller - get more light and air into the house - particularly in the public spaces - maybe go as tall as 4' 4" so you have about 28" below inside - you can still place a chair or desk without obstruction. On the front where they have three panes side by side, I would instead do two larger pairs - and replace the shutters with planting boxes underneath on wood brackets .. it will make the whole house seem taller. Right now your shutters are not really sized for the window width and if they were they would overpower the house -

In the back or side I might turn one into a french door or double sliding glass door.

Not sure where the egress window for the basement is - (right under the front door?) can't see ... if it is the area under the bay .. that is easier .. a house like this could make a big deck with a planting pocket to let air and light below .. even add a screen to it to catch things. You might like to do this painted white, and paint the front door behind the great crossbuck storm door. White window boxes, fat white trim around the new windows.

If you brought the entry deck / courtyard surround and paving for the garage closer to the front of the house - (deck should be set back about 8' to allow for planting along the front) but driveway in pavers or concrete should extend to there . . . the railing along the front there would be charming. If you want / need to keep a ramp, you could run it perpendicular to the garage coming back towards the street, but pair it with wide stairs right off the driveway.

If you pour more concrete for the drive . . consider a solidier course of bricks as an expansion joint between the two (pavers would work fine for this) and banding the outside with the same soldier course. This little bit of paver work adds to the cottage feeling.

The previous suggestions are all excellent. I too would loose the bay window in favor of four rectangular, but taller mulled together windows with the two centers fixed and the two others casement. You could match that pattern to the left of the bay window as well. For color try the Sherwin Williams color called " anonymous", or other equivalent. Everyone is always asking " what color is that" . . It's a nice greyish to olive green that seems to change hue given the time of day and/or seasonal sun angle.. A lighter cream or beigh trim always works well. Lighter trims make walls appear a bit taller which mitigates ranch design's tendency to look squat or way too long.

Oh .. hurcherra's note made me realize mine might not have been well understood. In each opening, I would only use two windows side by side . . possibly three if the overall was 8' or so - when I referred to a pair - I meant the two openings on that elevation ..

I hear you - double casements with colonial grids might be your favorite then.