All else being equal, a source is considered more credible if it is ?

I can’t answer, could you please add photos or a document with more information so I can answer accurately??

I need to see a picture or something for this

I'm pretty sure illustrators are often represented among the staff of an advertising agency   

The  knowledge gap  as been recast more recently as a “digital divide”  gap. with the internet and social media many things can be done faster and better. so much faster and better that those that do not have access to them are literally left out of the game.