The text is not really blurred but still hard to read since you added a white outline. It's usually better when it's only black or another color might do.

The forests are a bit dull because it's the same repeating pattern. It's a great brush but you should add more variation/randomness.

And as a tip concerning the file size, the limit is something like 4.67 mb and maybe 5000 px x 5000 px. To get the best results, use jpeg over png and chose a lower quality. It's not that bad and really reduce the size of the file.