In your second picture, your seam allowances are not all the same. Some of the corners are off, and this will affect your piecing. Some of your sides will be too short, and that will stretch on your other blocks.
It doesn't really matter whether you use a 1/4" or a 1/2", but it has to be a consistent 1/4" or 1/2" seam :wink:
Be very careful, you have bias edges... handle them carefully or they will stretch and distort.