Hello Sowmya,
Your poster i have seen and its perfect to display on the notice board. Dont waste your time in making in more and more attractive, this thing should not consumed so much time as it has consumed by now.
The freshers are in that stage who are always alert to grasp any opportunity, your message should be very clear and it is in the poster. The thing which is annoying that such a small thing has consumed so much time of yours and discussion is going on and going on. The candidates who deserves these positions will be attracted by your current poster, even u keep it black and white, just be careful in selecting the fonts and type of fonts , size of fonts as per the importance of lines.
Your poster is perfect and go ahead with that.
Bibhutosh Bhadauria