I got Welsummer bantams but down to one right now. Yes, the eyeliner and V on head still applies to the bantams. But it is not 100 fool proof nor 100 percent reliable. There has been incidents that eyeliners occurred on roosters and vice versa.I have bantam silvers and the eyeliner trick does not apply, neither does assessing the V on the top of the head. I have noticed that the females are lighter at hatch. This probably would not apply to standard color bantam Wellies
The bantam Wellies are pretty! But they won't lay the same color as the LF cousins.