Followup. Here are some examples that might get you some inspiration.
For the portrait shoot for our dance troupe, here's the set we made in the venue. The troupe name is Moxie le Femme, and the shoot was themed around the Circus show we had in August - hence the styling. The brick wall behind the backdrop is very similar to your brick wall.
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Circus.20120618.0724.jpg
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nathancarter
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Standing against the back wall with my 70-200. The camera is on a tripod at about shoulder height on the floor, but the performers are on the raised stage, so the camera is about waist level to them.
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Circus.20120618.0705.jpg
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nathancarter
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A little closer with the 50mm prime:
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Circus.20120617.0323.jpg
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nathancarter
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Up close with the 14mm (EXIF still says 50mm because the lens has no electronics)
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Circus.20120618.0747.jpg
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nathancarter
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Using the flash to stop action:
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Circus.20120618.0722.jpg
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And, here are some from the Rocky Horror show, with the brick wall backdrop. This is outside in the alley on a very windy evening - too windy for umbrellas, so I just used two bare Speedlights. You'll have more flexibility with your modifiers shooting inside. Remember that a bare light will give a defined shadow as seen here; a small modifier will dive a diffuse shadow; a large modifier (umbrella) will give almost no defined shadow (like your shots from last year).
The two hard lights and the contrasty processing probably aren't what you want for kids, but using an umbrella up front and a different style of processing will give quite a different look.
One of the things to take away from here - and it seems like you got it down already with your backdrop shots - is to get some space between your subject and the backdrop. People will want to gravitate to put their backs against the wall. I stick a little blue piece of painter's tape on the floor where I want them - 4-5 feet in front of the wall, if I have the space - and say "There's your mark, put one foot on that dot t all times."
Opinion: you have plenty of lights, so get a little hair or rim light in there. Doesn't have to be much.
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RHPS_20121026_0059.jpg
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IMAGE LINK: http://www.flickr.com …/nathancarter/8136974338/
RHPS_20121026_0050.jpg
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nathancarter
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IMAGE LINK: http://www.flickr.com …/nathancarter/8136933573/
RHPS_20121026_9993.jpg
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nathancarter
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Yeah, I'm going against my own advice on getting the camera parallel to the wall, ha ha.