A question about crediting

[avon7.livejournal.com]

I hope this post is okay here. If I take an icon I always credit as asked in the pic comments or keyword but... how can anyone see that? When I see an icon on an LJ post that I love, and I try to find out who made it so I can see if I can get permission to use it, I can't find any way I can see the pics comments. Presumably there must be - but no one on my friends list could tell me how it worked either so I'm not the only one lost. Additionally - if someone just says please credit then where is the prefered place to do so? Thanks.