Looks like you guys are off to a great start. Its really hard to tell at just a day or two old. More pics in a month and you'll be able to tell more. That ones looks to have pretty good bone structure, but thats hard to tell now. Congratz on your calf, look foward to more pics!!!!
Remember, right now in the calfs' life the main thing is they are on the ground, healthy, and milking!