In order to be effective in the field of art and design one obviously needs to be very creative and have high levels of artistic ability.
You will need to have excellent communication skills and be need to work for long hours too. You need to be very persistent many a times till the time you dont get your imagination or rather the client's imagination on paper.
This is not a cushy 9-5 job. Here you'll have to keep in touch with your clients on a day-to-day daily on a strict deadline.
Hope this helps.