EMB145 MARSHALLED INTO BAGGAGE CART AT ORD DURING PARKING.

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RAMP SUPVR INFORMED ME THAT A BAGGAGE CART WAS PUSHED UP AGAINST L WINGTIP. DURING PARKING AT GATE WE HAD 2 WING WALKERS; 1 POSITIONED ON L WINGTIP AND 1 AT THE NOSE OF ACFT MARSHALLING ACR X INTO POS. NORMAL SIGNALS WERE USED AND AT NO TIME WERE EMER STOP SIGNALS GIVEN. WHEN FORWARD MARSHALLER GAVE STOP COMMAND IT WAS A NORMAL COMMAND AT THE PROPER ACFT SPOT. NO ADDITIONAL SIGNALS WERE GIVEN TO FLT CREW AT ANY TIME. FO WAS MONITORING R SIDE OF ACFT DURING PARKING AND ALL WAS CLR ON THAT SIDE. THERE APPEARED TO BE NO DAMAGE TO THE ACFT AT THAT TIME (MINOR SCUFFS ON GLARE SHIELD ONLY). THERE WAS NO 'BUMP' OR ANY OTHER INDICATION THAT THE ACFT STRUCK ANY OBJECT DURING PARKING PROC. I WAS NOTIFIED ONLY AFTER I HAD LEFT THE FLT DECK TO DO THE WALKAROUND AND SAW A GROUP OF PEOPLE HUDDLED AT THE WINGTIP. I WAS INFORMED 16 MINS AFTER PARKING THE ACFT AT GATE. ACR RAMPER INFORMED CREW PRIOR TO DEP THAT THE FORWARD MARSHALLER ADMITTED TO HIM THAT HE WAS NOT LOOKING AT THE ADDITIONAL MARSHALLER POSITIONED AT THE L WINGTIP AND MISSED HIS COMMAND TO STOP THE ACFT. INSTEAD HE SAID THAT HIS ATTN WAS ON THE R SIDE OF THE ACFT DUE TO PROX TO A GPU POSITIONED AT TOP OF PARKING SPOT. I HAVE NO SIGNIFICANT RECOMMENDATIONS AS A RESULT OF THIS EVENT. IT IS IMPOSSIBLE TO SEE THAT FAR TO THE REAR AND TO THE L WHILE POSITIONING AN ACFT IN THAT TIGHT A SPOT WHILE MAINTAINING WATCH ON THE FORWARD MARSHALLER'S COMMANDS. MARSHALLERS MUST TAKE THE PARKING PHASE OF ACFT SERIOUSLY AND SHOULD DEVOTE THEIR FULL ATTN TO WHERE IT IS REQUIRED. SUPPLEMENTAL INFO FROM ACN 703851: THE PAINT LINES DEPICTING THE SAFETY AREA AROUND THE PLANE ARE INCORRECT. THE ACFT'S NOSE WAS PARKED STRAIGHT ON THE LINE YET THIS ALLOWED THE L WINGTIP TO EXTEND BEYOND THE SAFETY ZONE. TO PREVENT THIS EVENT FROM RECURRING; I SUGGEST RE-EXAMINING THE SAFETY ZONE PAINT MARKINGS.