Ok this looks a lot like a snapshot but I was actually trying to follow the idea of sticking with the "rule of thirds" (I despise it, its not a rule its a myth but in some ways its close to the golden mean). So this more about trying to get a pleasant composition and the three panels do lend themself to a three-way split.
When you take a photo inside you may not be able to get far enough away from a subject and have to use a wider angle view to get everything in the frame. However, what happened is the edges of the resulting images can tend to bend and often curve in. Typically if you are photographing slightly down the verticals may bend out, if your looking up the verticals can bend in. I'm sure you have seen these effects. So you might have a couple of issues to fix. On really wide-angle lens you get what is often called barrel distortion. Things are wider in the middle and bend in at top and bottom. If you are using an exchangeable lens camera a lot of software (like lightroom, On1 & CaptureOne) will have lens correction tabs and tools which will recognize the lens type and focal length then will correct for this barrel distortion. The second item to fix is the converging or diverging verticals, and for this you should use a tool usually called Keystoning, Some cameras now have this ability built-in, the great little app Snapseed (see Tools/Perspective) can do it on your phone and many large software packages can also do it nicely (but not always called keystoning).
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