You can use images portraits from photodune.com, with a link back to the image, just remove the portrait in the final main file. You cannot use images of celebrities, hope that helps.
Typography has a lot of aspect to it unfortunately it is not just about pairing the right fonts, here is a great article about Creating Exciting And Unusual Visual Hierarchies in Typography http://www.smashingmagazine.com/2013/02/26/creating-visual-hierarchies-typography/
@ muntashir, Don’t compare your designs to the worst designs on graphicriver, instead compare them to the best designs. Unfortunately from what I see, you will need to improve your typography skills and overall graphic design skills, I would recommend studying some tutorials over at http://design.tutsplus.com/
All the best.
You can use the low resolution preview, most times that is enough.
Congrats Chris, keep up the good work!!
Became a member on December 2008, but did not sign up to be an author and start selling until September 2012 ( I was intimidated by all the great designs). I am really surprised at how fast I made sales!! I am thankful to God for leading me here, since it was always a dream of mine to do something with the design skills He gave to me. Thanks to all the buyers and friends, especially the ones who gave encouraging and constructive comments on my items. This is a very vibrant and active community that I hope will be here for a very long time. For anyone reading this who wants to be successful here on Graphicriver, check out my blog post How to Design and Earn Money on Graphicriver