What is the black border on the top and left?
If the background isn't there for any specific reason, consider removing it entirely. Often, sprites look better just presented with a transparent background. If you do want to include a solid background for some reason, consider adding some padding between the bottom of the sprite and the edge of the image - tangents like the current one can make it harder to "read" the image.
thx for the advice, I`ll definitely use it