You might consider some of the things said about Neil Robinson's recent image post.
But for you:
Technical:
Your image misses using the important undersun to eliminate "Black soffit" disease on arches when there is no uplighting.
Take a sun object, make its setting manual and place it at -90 degrees altitude to create the "undersun." Shadow "off."
Compositional:
-- this image would benefit from a lower sun angle to keep the porch from being so uniformly dark, even though you have placed lighting there.
-- Never compose a scene where the front door isn't inviting, especially by putting barriers to the eye being led to the doorway.
These things are all covered in more detail on pages 27-36 (Quick Start Guide) of the book "LightWorks in ArchiCAD."
(Hint - several other things in that book can speed anyone to improved LightWorks skill.)
Dwight Atkinson