Power wash the house. Add a path from the porch (including the other steps, assuming they don't go to nowhere, which is what it looks like in this pic). Paint the addition white to match the house. Add landscaping. If you're not a gardener, you want a mix of shrubs. I like flowering evergreens like Rhodos, Azaleas and Mt. Laurel. But if you want landscaping advice, you have to tell us sun/shade, zone and nearest city. And if your soil is particularly sandy or clay-ey. And if you have a deer problem.

Why do you have stairs leading to nowhere under a window on the right in the yellow section?

You should have a path leaving the front door but to which side? we see nothing but the house.