I added the CC license under the head of the blog to make sure everyone can see it.
Basically, the most important is:
You may copy, distribute and transmit the artwork under the following conditions:
- You must attribute the work in the manner specified by the author or licensor (me ;b) (My name and/or a link to my blog it's enough)
- You may not use this artwork for commercial purposes.
- You may not alter, transform, or build upon this work.
Therefore you don't need to ask permission to share it as long as you follow the conditions... and I think that they are very reasonable in exchange for enjoying the artwork for free.
If you need any clarification you might ask here or email me at firstname.lastname@example.org