The brick and stone on your mid century modern house are more contemporary than the blue gray on your garage door. I can't recommend painting the brick at all - it is a great warm gray tone blend that connects back to the off white brick tone. May I suggest a new strategy? What about a darker warm gray out of the natural stone tones - test bm copley gray (sw and hd will make these ben moore colors if you don't have a ben moore outlet) http://www.benjaminmoore.com/en-us/paint-color/copleygray

put this on the garage door - the white prefinished eave and fascia matches the trim around all the doors and windows or you might try contrast there. Use rustoleum oil rubbed bronze and mask off your 50's aluminum post and rail paint it all out dark bronze.

(Probably they are not yours but) Take the fussy footed pots away at the base of the stair and on the porch and around the garage - if you can afford some bronze toned modern shaped planters, do that - you want a mid century modern vibe in everything you do outside

the wood / walnut finish front door is a great look for this house -

I like all of the pale colors of your house right now (although it's possible that that portion of the brick looks more galling up close). My first priority would be giving the garage door a new color that makes it stand out less (maybe a pale greige), and then doing something to better emphasize the entryway from the driveway. Anohter possibility would be to take the neat sharp line of the roof over the porch and echo it with a pergola over the garage, which would help break up that long face of the house and add another modern element. I think this house is really neat!

I would suggest painting the garage door and the fence the same color or put up a wrought iron fence across the the front and add some color with bushes behind the fence. Pull the extra color from the brick and add flowers in that color scheme. I would leave the house paint alone and let the next owner decide if they want to paint.