I love that you didn't bullshit your way through the whole art thing. Like, you didn't just say "Castiel drew a painting of Dean,". Instead you described the medium and the subject of the painting, and whether or not it was detailed.
I also really enjoyed the fact that you incorporated so many little interesting snippets into the story. Rather than just taking the easy way out and saying 'they met in freshmen year and now here they are four years later', you actually gave background on how Castiel came to have feelings for Dean. I also really enjoyed the small background story on the mirror portrait of Dean.
Yeah, so, overall, good job. I really enjoyed it.
P.S. I know what you mean about people not commenting on stories on Mibba. This seems especially true in the Supernatural section for some reason. I guess it's not very popular on here...? Well. That's what Tumblr's for, I suppose.
It was amazing :D I can totally picture Castiel being an artist (a freakin' fuckin' talented one !) The idea of him drawing Dean's body parts is so good and I'm in awe right now god. That was so cuuuute! Destiel will be the death of me. It was really well-written, touching. The end made me smile like crazy and I loved the flash-back when Cas understood that he was developing feelings towards his best friend.
And I totally agree with Dean (and so, with you I suppose) when he says that emotions carry more emotions. :)
So yeah, I love this one-shot ! :D And for a first slash fic, it's really good ;) Keep up the good work!