Great work on this house! I don't think I have anything in particular to point out this time. I think you're ready to learn more by working in the server. So consider yourself approved! Next time you're online remember to ask a mod to promote you.
Now that you are approved you should first read our New Builders' Guide and then make your probation thread. A probation leader should answer the thread and took over your probation within a week, but feel free to send me a message if that doesn't happen. You can find plots to build using the Dynmap (there's an option called "Open Plot" that shows available plots), having a look at /warp build (that may be outdated sometimes) and by asking other builders. If you wish you can ask a mod to give you a plot in the Test world where you can practice building.