After the comments from my first post, I went back and tried again using some fill flash. I had to set the flash to 1/64th otherwise it was too bright. The last one in the series was shot without flash for comparison. C & C appreciated as I'm struggling to learn to shoot indoors with awful lighting!
I don't remember exact settings but I would lower the ISO (~640-800) and up the flash power a little...this will brighten colors better more like #1 & #2...the other are too dark with shadows on their faces...the flash should get rid of this.
Not too bad for a 2nd try. You seem to have a yellow cast on these shots though.
I would suggest lowering the ISO to around 400 - 640 depending on the lighting that you have available. Set the flash to ETTL and AWB, manual mode and ss @ 250, fstop at 3.5 or 4.0. I use a 70-200/2.8. Here is a sample of what I have shot with these settings. These were in a high school gym
Thanks for the feedback. I think the first couple of shots had a higher power on the flash and I had to recover it in ACR. But I can see how the suggestions given could produce better results. I will give it a try.