I hope you don't mind receiving little constructive criticism and suggestions from an art school drop out...
Your pictures are really good. It would be a shame if you gave up on submitting them to any of the other stock photo sites out there... Your angles are great, images are in focus, color and exposure look good to my eyes. I just have a few suggestions concerning the way you framed your shots.
I think your first shot was awesome, my only real criticism is the way the way you chopped Rogers legs off at the knees. I would have left as much leg as possible and included the floor monitor in the shot. I'm not sure if what you posted was an unedited shot or if it was cropped in Photoshop... If it's still posible to get some more leg in there, I would.
I'd maybe crop out most of the blank space . From a news publishers perspective, blank space is probably considered waste of money so it might as well go. Stick with the old "rule of thirds". I'm not sure if you know what that is; for the sake of those reading this that don't, I'm going to try illustrate it. I don't mean to come across like some know it all wanker, I'm just writing this up as a small guide for anyone who might be interested. I'm by no means a photographic expert. It's all subjective anyways...
Rule of thirds:
Basically when your taking a shot you divide your space into thirds and place your main point of interest (in this case Rogers face) on one of the intersections circled in light green. Usually its best to go with one of the ones on the right side because most people read an image from left to right... unless your from Asia... anyway...

This is how I might try frame the image:

(The dark green arrows indicate how my eyes tend to move across the Image when I look at it.)
Your second photo is my favorite. Again the Angle is fantastic, etc. It might need up the brightness and contrast brought up a bit, thought my monitor might just be out of whack. THe only thing I feel absolutely needs to be cropped out is the mike poking out from the left side of the frame. I really dig the candles trailing of into the distance... which might be problematic in this case. The candles are your main point of interest, they are to my eye anyway. My eyes should be drawn to Roger, he's the subject. Instead when I read the image I start at the mike and my eyes skip right past Roger and get lost in the sea of candles. Either that or I start at the elbow and my eyes zip across that diagonal line and out of frame... or I get fixated on the candles again.

If I didn't want the canldes being my main focus point, this is how I would frame it up:

framed this way, my eyes go strait to the subjects face, take a nice like stroll along the flames, across the PA, take a break and admire Rogers mad skillz, and then return back home to his face.
Anyways, That's all just my humble opinion. If I were you I'd post 'em on a photography forum and get some feedback from the pros of stock photography, if you haven'y already done so... or just go and there and start taking brick wall shots like mad. I might jump on that bandwagon myself.