It's really too young when they are that age. The absolute minimum age you can "start" to predict show quality, if you're very experienced, and know your lines, is 8 weeks. 6 months is the standard age to start labeling pups as "show prospects" and 10 or so months, "show quality". The first 3 all look like dilutes, which won't show well. The last will be the best coloring-wise for show IF he gets black pigment. If not...I'd keep looking