When painting interior spaces try choosing a color for your main room and adjacent rooms a couple of shades lighter or darker for a smooth transition. Use tones in the same color family. Another way to add interest to your interior is adding a chair rail. Paint above chair rail a lighter color. Below the chair rail try a deeper shade of the color above the chair rail.
Create coordinated colors for flow throughout your home by using complementary color palettes. When adding accessories to your spaces try using contrasting colors for more interest. Many paint manufacturers can provide sample visualizers for reference.
Texture and sheen are also a factor in interior painting. Flat, satin, low-luster and eggshell are good picks where low sheen surfaces are preferred. Flat paints downplay surfaces where you want less attention and can smooth rough surfaces. Glossy, semi-gloss and high gloss provide higher sheen and can bring focus and attention to surfaces you want to highlight. Decide what style you are looking for in your space, what purpose and use the space is for. Glossy paints can provide some protection in areas where grease and humidity can be a factor such as bathrooms and kitchens.
For a long-lasting beautiful finish, the surface being painted should be clean, smooth, dry and coated with a primer suited for the surface and type of paint you will be using.
Consider a professional painter to complete your paint project who can properly manage the application and clean up with the precision your home deserves. A professional painter will save you time and frustration with your paint projects.