I am thinking you got confused on how to ask your question. A poll is not the best way. You would be better off just posting the full front porch photo and asking for colorful plants for the beds.

First, though, I think the evergreen tree at the right side of the porch is too close to the wall and porch. It may actually be under the overhang as well. This will cause the plant to lean away from the house, not to mention the roots could damage the foundation. Move it now while it is still small, and consider its eventual mature size when you choose where to put it. Every plant is going to be small when you buy it, and you need to pay attention to how tall and wide it is expected to grow. If a plant is expected to grow 36" wide do not plant it closer than 18" to a wall, fence or walkway. If your flower bed is only 24" wide it's too narrow for a 36" wide plant. Your best bet is upright perennials such as iris, tall phlox, and daylily.

Should I paint the shutters?

I like your crisp gray and white, and so would not paint the shutters - perhaps paint the door a pop of color. A dark red would be classic; some people like yellow with gray (I don't particularly); or repeat the blue in your pots. Hmm, actually I think a dark color would detract from the gray/white balance, so perhaps a light blue, similar to sky blue or to your pots.

Your house already has tons of curb appeal! I would, however, remove the shutters. They are obviously not operable and I think your house would look better without them.

I would keep the shutters; I think they suit the house/porch aesthetic even though they don't meet the typical criteria of shutter sizing.

RE Plants: you have a nice start in your left hand bed. I liked the varied textures, colors, and heights. Looks like you need a bit more of that on the right. You could experiment with placing flowering annuals in pretty pots among the greenery - the pots would add winter interest. There are nice "carpet" evergreens that could work well, also