If you go to photoshop>preferences>guides,grid&slices, you can change the setting so they are like the ones below (Only the grid settings). This will make the grid automatically split it into thirds both vertically and horizontally. All you have to press is ctrl+' (cmd+' in my case because I use a mac).

With grids:

With grids:





Any opinions? I'm just getting bored at school so I basically am just whipping up signatures on GIMP. I'm asking for tips and stuff and contemplating a shop (maaaaybe) if I can get my skills even half as good as those like LaCorpse or MissMaw :D

Thanks to Janitsu
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You'll often want your main focal as close to the green circles as possible.
Here's the latest sig I made:
Just a heads up, I opened a signature shop just today. I will be doing sigs for you guys if you like the way I make them. I'm still new at making signatures though but I'll try my best :)