Hi Martha, Kimberly here from landscape-solutions-for-you.
Barberries are deciduous and an idea for you is to plant some smaller, or dwarf evergreen shrubs in front of them. This is a great way to incorporate year around color in your front yard.
Ones that come to mind are:
Dwarf Hinoki Cyress - solid green
Dwarf Arborvitae - solid green
Mop Cypress - variegated yellow and green
Ruby Chinese Pizazz (dwarf Loropetalum) - year around purple and green leaves with tiny pink to red tone flowers in spring and summer.
Blue Star Juniper - teal tone slender needles
Sunkist Arborvitae - variegated green and yellow
Globosa Nana - rich green tone soft needle like leaves.
These are just a few suggestions. One thought for you if you want a little more color than just one other shrub. Intermingle a few of the above plants throughout the front garden. You will not only have a good balance of color, you will also have some different texture. These shrubs are adaptable to your climate zone. If your don't care for any of these, make sure whatever dwarf or small shrubs your choose is the correct height and width to go in front of the Red Barberry.
Hope these suggestions help some and the best of luck planting some new shrubs in front of your Barberry. Feel free to ask questions anytime. Have a great day!
Kimberly