To see the value of fabrics, copy them on a black & white copier/printer. All the fabrics will appear different shades of grey on the copies. You can then sort the actual fabrics according to light, medium and dark and add as needed to each shade. You can also use a piece of red acetate (sold in quilt notions area) to view the fabrics through. The red color makes the fabrics appear grey. Hope this helps.
Yes, I agree, you need more lights in your collection. Love the fabrics you do have! Can't wait to see the finished quilt.
Anita