You are absolutely sure of two things - that the dossier found on the floor in the corridor had fallen out of your pocket and that you are a detective. The found handcuffs are quite eloquent. In addition, you don't look like a merchant or investor at all. You just can't imagine yourself in that role. For an artist, you don't have the necessary temperament and you rather don't like public attention, you are more comfortable being in the shadows and watching.
A doctor and a scientist are most likely THE CHEERFUL ONE and THE SMART ONE.
THE RICH ONE, with his ring and sleek face, looks like a rich heir.
And THE HANDSOME ONE with a huge amount of cash looks more than suspicious. It clearly smells like illegal deals.
THE CONFIDENT ONE has a strange look, as if he is under the influence of some kind of drugs. You should take a closer look at him.
By the way, the list of passengers is clearly shorter than the number of people on the spaceship. I wonder why?