What are some alternatives?
When comparing Carbonmade and Psddd, you can also consider the following products
Behance - The Creative Professional Platform.
DeviantArt - deviantART was created to entertain, inspire, and empower the artist in all of us.
pixiv - pixiv is an illustration community service where you can post and enjoy creative work. A large variety of work is uploaded, and user-organized contests are frequently held as well.
500px - Connect, get inspired, and grow your skills.
Dribbble - Shots from popular and up and coming designers in the Dribbble community, your best resource to discover and connect with designers worldwide.
Format - Online portfolio platform for creatives; photographers, designers, artists and more.