What are the things that one should take into consideration when taking a professional photo ?

On my opinion professional photography consists of three main features

1. Technically correct (lightings, camera settings, color, composition)

2. Responds to client's needs (or has a concept if it is an art or hobby)

3. Creative (creativeness is something that differentiate photographer from professional)

Along with the Technical skills (ex lights, composition, ... etc) , If i'm taking the photo for personal pleasure , It has to send or provide a certain Message , and if i'm taking it for a client, it has to answer the client's prespectives and satisfaction.

first you need to talk with the clients on how they want a specific photo to be and from there it would be easier for a photographer to make a composition based on the client satisfaction. the rest is the magic between the photographer and it's camera.