The character is fairly simple as he's a regular guy in a present day setting. The concept shows him in a standard set of clothing he could be seen wearing. I wanted to say as much about the character as I could from wearing standard clothing. As a person, he yearns attention internally. Although me may not show this in his personality he may subconsciously reflect this externally (visually). Thus he has a slight alternate style as he craves attention internally. Aspects such as the tattoo and t-shirt show his love for space (openness - see the big 5 dimensions), with the tattoo further suggesting he is a loving person, with the use of the rose.
When I have to show the character in different emotional situations it will be clearer the type of person he really is.