I think a light gray or greige would look good with your brick and roof (gray?). The brick is nice...don't paint it. Black is nice for the shutters. Just make sure the shutters are wide enough...each one should be half the window's width. Think about beefing up the post by your front entry. Looks like a pretty house and setting.

ETA - Just like you have now, keep the garage doors the same color as the siding. Some windows across the top of them would add interest.

I think a medium warm grey (no battleship) or taupe with white trim has the best possibility for presenting a cheerful disposition. Dark colors and dark trim seem gloomy or severe to me. Here are some ideas for landscape organization.