Are those pictures your starter? How long has it been in there? There is no visible activity, so far. With most starters I get foam within a couple hours, if it comes out of the fridge it may take a day. With a swollen Wyeast smack pack it starts foaming almost immediately.
Just an observation, but that 1L flask is too small to make a large enough starter for 5 Gallons.
My Belgian Ardennes was a bit tardy too. The smack pack fizzed but did not swell up much at all. Once it was in the starter it perked up and although slower than usual it grew just as large a krausen, and foamed out the top.
I'd say give it some more time and reevaluate. If that smell persists, hmm, not sure what to say.