You may find turning on the grid display in the viewfinder helpful
In the very first Tip I told you how to use the Virtual Horizon to help keep your pictures level and to help you eliminate those pictures that slant. In this tip I will show you another option that you may find useful. In the menu system you can turn on a grid display that you can see in the viewfinder while composing your pictures that may help line up and keep things straight without using the virtual Horizon. The grid display is there without being distracting or annoying while shooting. I find it useful and leave mine on all of the time. Like all the tips or ideas in my thread it is something I would suggest trying out and if it is an option you don't like it is easily changed and removed.
Here is how you do it
Go to the CUSTOM SETTINGS MENU which is the third one down on the left that looks like a pencil and press "OK"
Go down to the "D" Shooting/ display and press "OK"
Go down to "a2" Viewfinder grid display and press"OK" again
Choose "ON" and press "OK"
Now, unless you repeat this and choose to turn the display "off" the grid will always be displayed in the viewfinder to help you keep things straight and level. Hopefully this is something you might find useful, Jeff