Oh, no worries. You're new to the system, after all. I used to do it all the time when I was new too! :] And thank you so much! <3; Though I'll be honest, there's not much I did with my signature image. I used a bit of selective colors, gradient maps, some adjustment layers comprising of 'curves' to enhance the colors a bit and used a bit of the good 'ol burn-n-dodge tools to adjust the lighting, that's all! And yeah, you do need fifteen posts. That rule exists to prevent people from spamming the place with unnecessary or inappropriate images. But I'm sure you'll have those fifteen posts in no time. ;]
You may browse through and comment on some threads in A&D to get those essential 15 posts, anyway. I know this may sound selfish but why not start with my thread, lmao? Here:
http://www.pokecommunity.com/showthread.php?t=287038