Well not to sound harsh, but as a graphic designer I can tell this isn't made by a designer... instantly.
The style is confusing, the drop shadow doesn't help the shape (also not good for print production) and the typography, especially in the last, doesn't work.
Also be aware that with most stock images, you are not permitted to use it as a company identity. A few stock companies have started to make sections for logo shapes that can be purchased for this purpose, but the majority don't and can bring you a legal battle in future if your unlucky. Just so you know.
Having said all of this though, if you still want to go ahead with it... it isn't terrible, and is fine for someone just starting out, it just isn't professional looking.