i have a question - like always

i want to paint a forestpath into my game. With just a Texture... but the size of the pencil is too big (i cant make it smaller - because its the smallest size "1") - in another map the pencil is smaller than in my actual Map (with the same size in settings). So i dont know why the pencil size is different from map to map?
Maybe you can help me?
Thanks a lot and nice day!
Robert