They are pretty good! But I do have a few suggestions...
Frodo&Sam:This one is great! I love it! It is very nicely blended.
Legolas:The pictures are placed very well. But when you make Legolas transparent over another picture, his head looks all 3D and weird...the picture on the very right is a little too dark compared to the other pictures. And not all of the pictures fit together. But I do like the font you chose.
3rd one:This one is nicely blended. But the border is a little too thick...Nice font choice!
Boromir:This one is also blended nicely. I love the way you placed your pictures. I would suggest to erase the part of the picture that goes over the middle picture of Boromir...it iterferes with his head. But I love it! I think I like it better without the text.
Boromir Avvie:The only comment I have on this one is it's a little too wide.

Maybe you could have used a border...
Well those are my comments/criticsms for now. I can definitely tell that you are improving. Keep it up!