Those appear to be Japanese yews from previous experience. Personally, I like them as specimen plants, not grouped. I would dig up one of those and plant it in front of the column on the left and reposition another in front of the column on the right. I would just get rid of the third one unless I had another spot for it in another area (corner of the house and plant a matching plant at the other corner possibly). Keep the Yews trimmed for an upright growth habit and they will be 6 feet plus in short order.
It looks like those beds need some organic material like a bedding mix turned into the existing soil and then a 2-3 inch layer of mulch. Regarding shrubs, you might consider some Japanese Boxwoods. They are evergreen and are both cold and heat tolerant. They do need regular watering. They do need trimming/shaping once or twice per growing season. They can be shaped into square hedge or rounded off individually (my preference). Electric or gas powered hedge trimmers are best although you can use hand operated shears.
For color from early spring to late fall, consider drift roses. They are low growing and bushy, they need to be cut back extensively in late winter (like two thirds) and to a lesser extent in late fall. They are very hardy and bloom profusely in decent conditions. If you want something taller, consider Knockout Roses. Again they are very hardy and bloom non-stop from early spring to late fall. Cut back 1/3 of their length in late winter along with eliminating crossovers and dead branches.
For a fragrant, flowering evergreen shrub, consider 'frost proof' Gardenias. I've had very good success with these.
For a low growing (6 inches) wide spreading (18-24 inches) flowering ground cover, consider creeping phlox. It is quite hardy and produces a prodigious amount of flowers.
Day lilies and agapanthus are easy growers and prolific bloomers. My wife orders new varieties every year from Breck Nurseries in Holland but you can probably find plenty in your local nursery.
For large areas, consider Lantana. Very hardy, a prolific bloomer and attracts pollinators.
I am not the Six Million Dollar Man, but I might need that surgery. "We have the technology, we can rebuild him!"