A great way to keep track of where you are in a PixelArt pattern is to set up a ten grid. I use the reinforced platforms and marble along the sides and bottom to mark form a grid alongside the backwall.
After your backwall is complete count out every 10 blocks and place a light. This will help keep track of where you are on your pattern.
When you start painting use the lights and the marble markers on the side to make sure you are painting in the right place. Most of the patterns I use are cross stitch patterns and are already set out in a 10 grid.
You can even easily add your own additions and make changes to a pattern this way. I added a dodo to the bottom of this pattern.
This 10 grid method saves time and frustration on PixelArt projects. I have even started to use it on my block PixelArt to speed up the process.
