Answer : Yes. Interior decoration is a creative job, and creative jobs can be learned with enough dedication and practice. There are a number of online courses that offer a diploma or certificate in the field, such as via Udemy or Coursera. Classes cover art history, color theory, graphic design principles (vector images vs paintings), psychology of color perception (contextual relativity), architecture practices (spatial awareness). The courses will also require time spent on other work like reading articles for comprehension and working on assignments to demonstrate mastery before an instructor will grade them for assessment purposes.