I think you're on the right track, but I agree that the fabric with the small black flowers belongs more in the dark pile than in the lights. It looks like one of the strips in the second block is dark where it should be light (the giraffe pattern). Amazingly, it still looks great. Log cabin can be a very forgiving pattern, and your fabrics are lovely. I actually like the black mixed in. I think it makes for a more dramatic quilt. Keep going and you will have a stunning quilt.