Let's say Paper A was recently accepted by a fairly prestigious journal (the top in my subfield). Now, there is a new Paper B, half of which gives a more detailed description of an object in Paper A for pedagogical reasons. This half of Paper B may not technically be new, but there are lots of pretty pictures in it (not merely pretty, of course, they accurately illustrate the particular object of interest). Much effort went into creating the illustrations, and this will probably be apparent to the reviewer.
What are the odds that the same journal would accept Paper B, if the first half of Paper B would not be accepted on its own merits? To what extent can an editor's or referee's judgement be affected by nice colorful images?