Dave, the best advise is to be patient. I grow a lot of paphiopedilums and they seem to take their time blooming. Although some are quicker than others, for the most part it can take over two to three months from the emerging spike to grow to full size and bloom. Your paph looks like it's in good shape and should open within the next week or so. Make sure it gets diffused light and doesn't dry out for a long period of time. Paphs are pretty easy to grow and are pretty reliable bloomers. You'll be happy with your new orchid, just give it some time! Oh, and post another photo when it does open. We'd all love to see it!