Hi and welcome - Critique is a great way to learn what is and isn't working visually. Just realize that everyone has an opinion and there are no absolutes. Pay attention to constructive criticism, especially when more than one person offers the same advice, and you'll learn quickly.

You might also pick up a book or two. A favorite is Boyd Norton's The Art of Outdoor Photography. John Shaw also has some great books on the subject. Down the road, be sure to check out Freeman Patterson's books and work but it's a little "out there" when you're first starting out. Norton and Shaw's books will tell you about more conventional ideas behind photographs and the techniques to get the results that you want.