I'm an absolute atrocity when it comes to art work.
Currently, in terms of imaging we have nudone (which does the all-might cody and most of the artwork images you see on DC) and hamradio (which does almost every icon you see on DC programs / forum).
I'm sure another artist would be very welcome
It's good to hear that there's another helping hand around.
As for how to offer your help, i'd say this thread you opened can do (although others might have another idea of a "formal presentation"
Now all you have to do is, when people ask for some icon work.. Step up!