Most likely, the colors indicated on the design are going to be the best ones to use. This is because designers put a lot of thought into choosing colors that work well together and achieve the desired look for their project. However, there may be times when you want to deviate from the original color scheme. For instance, if you’re creating a design for a company that already has an established brand identity, you’ll want to make sure your colors match theirs. In general though, it’s usually best to stick with the designer’s original vision.