Use whatever image hosting service you like and post the link to /r/woodworking. The key here is it needs to be apparent that you've built the entry, and you follow the photo requirements listed in the contest rules. Submissions of finished photos only will not be accepted for entry. <-- I can't emphasize this enough, you absolutely need more than 2-3 photos for a valid submission. I will no longer accept entries that have albums that go from rough stock to 90% complete in one jump.
Some tools that are required for this project are Miter saw, drilling machine, pencil, tape measure, screws, etc. Those, who prefer a video tutorial instead, can visit the below link to a YouTube video tutorial that illustrates the process of creating a DIY Beer Bottle Crate. The video tutorial explains every step properly so that anyone can make a Beer bottle crate easily.