Hey man I think they look great for 3 weeks in to flower. It is hard to compare plant size at certain times due to variances in peoples grows nuits, lighting, etc.
Grow diaries has great tools for growers. If your on a android u can hit the menu icon top left. That will pull out menu, choose breeders, that brings up a list of breeders on grow diaries. Choose Barneys and it will take you to their breeder page where you can search for strains on the horizontal scroll bar.
This will provide all their strains and growing info on each strain. Flower times terpenes, plant structure, and a lot of useful info for growing. From what I found your blue cheese is about 8-9 weeks flowering.