I think you are doing good! When I look at your blocks and squint, a couple of the fabrics appear to be "mediums", the small floral print in particular. The log cabin block often has higher contrast between the light side and the dark side than what you have. Mediums can be used to good effect. If you want stronger contrast I would add some lighter whites and darker darks to the fabrics you are using but maybe you want low contrast logs.