Whenever working with bias edges, make sure your fabrics are starched stiff, the stiffer the better. It will make the bias "behave" better and when pressing will hold the press better. How did you make them-by putting 2 squares together, then sewing diagonally or did you cut the squares, cut diagonally, then sew? All good advice offered on here, I think.
But, I do think you did a pretty good job, regardless.