The one logo that really popped out at me is the Think One design. I think you aced that, I love the color scheme and text to image placement. I think your definitely onto something with the skillset you are developing.
We are always looking for fresh designers, and if you are looking to learn a lot in the process we could definitely help each other out. We design in team environments and within a 24 hour design marathon once a week (Wednesdays).
Collaboration is definitely key with the other team members to come up with a collective visionary of client projects. This process may help you out a lot in getting to know what really makes a great logo, and how to perfect your design skills. Let me know via PM or visit our site at www.designSPRINT.com!