"I like to incorporate the credits into the image :)"

What a wonderfully creative idea, E! 

The Other Apps gallery does have it posted in the header to please mention what "other" app(s) it is you used, but you'll see artists who fail to mention it.  So I'm not sure if posting guidelines would make much difference.  I seem to recall that the whole idea of crediting came about when folks started making comments like "... and thank you Chuck for your cool free space ship model..."  Pretty soon others were making such comments too.  Viewers would also make comments like "What did you use to create those waves?"  And pretty soon folks started listing extra tools used and/or that postwork had been done.  Point is, we tend to follow examples much better than posted rules or guidelines.  I'm all for giving credit and providing some info on what was done.  I just think it's up to the individual artist to do if they so choose.  "Choice" being the key word.      

Irene-