My dearest quilter's friend, first of all your color is beautiful, I love anything Purple, lavender etc... your work is not that bad,I've seen worse and/or really,really crooked. I could see you cut your patterns or template right. You just have to find
your 1/4 seam allowance and stick with it. Some fabric stretch than others, but I think the biggest problem here is your seam allowance, if you have time mark your cut fabric with 1/4 SA, so all of the cut fabric will be the same. Practice make perfect. The same thing with Applique. Good Luck!