Very good and consistent maps so far! However, if I may offer a bit of criticism, the graphics used to depict the 10 coins blocks as well as the mushroom/fire flower blocks are difficult to make out.
For the coins, the color of the font use for the "10" makes it difficult to separate the number from the coin graphic. As for the mushroom/fire flower, again the limited palette makes them blend with the block itself so it's hard to understand what it represents at first. Limiting yourself to the game's palette makes it difficult to improve things, but adding a black outline around the "10" and the mushroom/fire flower might make it easier to tell them apart from the background.