Stop worrying about “real” clients. Your portfolio is just a story of what you can do. Photograph your own home after you redecorate. Take “before” and “after” shots of your friend’s room.
Don't have a friend? Go to a thrift store, buy a sad lamp, and rewire it. Paint it a wild color. Photograph the transformation. That’s a project. You’ve shown you can take something ugly and make it desirable.
Redesign a virtual room. Find a photo of a bland hotel lobby online. Use editing software to paste in new furniture, colors, and lighting. Call it your “digital redesign.” It’s free, and it shows your imagination.
How To Become An Interior Designer Without a Degree - Home and Edibles