Can someone critic this photo. (amateur photographer)?

I know the photo composition isn't good but I was trying to practice using flash, not really familiar with the proper way of using it. The only lighting in the room is a white florescent light in the back.
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Nikon D90-Manual Exposure
Settings:
105mm
1/10s
F/5.6
Rear Flash (Flash comp -1.0)
ISO- 400
Auto White Balance
Added (1). Oh yeah this is on-camera flash. I'm haven't even started playing with my SB-900

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Cinema lens for both cameras?

I currently have a Nikon D3100 for taking pictures but i'm planning on getting the Eos Rebel Canon T5i… However i do not have one yet, but i really want to get a Cinema lens. Are there cinema lenses that would be able to work on both for the time being, until i primarily switch over to the new camera when i get it for filming?

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Please Suggest. Nikon 18- 140mm or Tamron 18-270 for Nikon D3300?

Please Suggest. Nikon 18- 140mm or Tamron 18-270 for Nikon D3300?

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Nikon D3100 Viewfinder is blurry?

Hi, so I got a nikon d3100 and for the longest time I have only been using the lcd screen when taking pictures because the viewfinder is just blurry.
I know there is a knob next to the viewfinder, but it doesn't really help as far sharpness. It looks really blurry and is really unusable as far as taking pics. The glass seems to be clean so I don't know if its just not aligned or something.

Please let me know if there is anything I can do to fix this problem within settings or any other way.

Thank you.

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Can I use remote shutter release and focus recompose?

Need some help please! Later today my family and I are going out to take some family pics. It's just going to be us so we will be using a tripod and remote shutter release. Is there a way to focus recompose while using a remote shutter release? We are all pretty tall and so we want to focus towards the top of the photos. If we us the center focus or the one right above it then our stomachs will be in focus. Nikon d5000, Thanks

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What settings do i put my nikon d3100 on to film in slow motion?

What settings do i put my nikon d3100 on to film in slow motion?

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How to use AE-L/AF-L button?

I have recently bought a Nikon D 800 Camera I also own a Nikon D5100 Camera. On my D5100 I can point the camera at a light, exposure will adjust, I can press the autoexposure lock button and the camera will lock the exposure I can move the camera and point at anything and the exposure will stay locked so long as I hold the button. On the D800 this does not work. I have pressed and held the button and simultaneously half held the shutter button and the exposure will not lock I've looked online I've checked the settings I cannot figure this out. Can anyone tell me how to properly use the autoexposure lock button on a Nikon D 800 Camera?

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What does a flash cord do?

I need to use my nikon sb25 off camera for a small project. I looked into wirless transmitters, but it looks expensive compared to a cheap flash cord? I just wanted to check a flash cord is used for off camera flash?

So my setup would be my camera on a tripod, then the flash about 2ft away on it's flash stand? With the wire connecting both the flash and camera to shoot as if thr flash were in the hotshoe?

Im new to using flashguns

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