Firstly, I would like to say keyword 'custom icon design' only get a 'Global month search volume' of about 720 from Google Adwords Keyword tool and this volume is really tiny in my view. Even if you are on top of SERP, you would not get much traffic.

I would like to recommend you to use some nice keyword research like above mentioned Google keyword tool to get some nice money keywords in your niche them do seo on them.
Wish this help,