For own enjoyment. Recently purchased and love the house but hate driving up.

Some colorful flowers around the perimeter of the house would be lovely with that big beautiful lawn. You could also using pavers or stones to match the roof along that walkway

Should we add a cover over front door? Do I need to make flower beds larger?

A properly proportioned Japanese Maple will do wonders for "u-shaped" areas that are close to the foundation. They provide unparalleled interest and once established and happy, are very low maintenance. Make sure you choose a variety that corresponds to the available space. Here is an example of one we planted for a client.

If you want to add something over the front door, you NEED to hire an architect to draw up plans that will work with your style of house. The reason I say this isn't to discourage you, but to warn you that this idea that anyone can throw something up that will enhance the look of their home is nonsense. My neighbor put a covered porch over his front and side doors, and I've heard more than a couple of people comment on how horrible it makes the house look. If it didn't decrease the value of his home by $10K, I'd be surprised.

On the other hand, a former neighbor up the street who was a carpenter by trade put a porch on his house that probably added $15K to the value of it, but it wasn't just extending the roof line down. He actually redid the design of the roof, and it's one of the cutest houses in the neighborhood because it was done right.

I would highly recommend working with a professional who can develop a concept based on the contextual understanding of your site.