There are some problems with drawing Mandelbrot set, if you zoom in too much then some artefacts start showing up:
The artefacts may appear because of how i coded coloring part of my code:
If you delete part of the code where pixels are grouped and then colored, the artefacts disapear and mandelbrot set looks like this:
In order to achieve it you need to change old code like this:
You can find version above in second branch.