Don't worry, your plants look great. Some strains just don't smell super strong when flowering (and some are bred for that purpose, since some people need to be careful with odor control). You've got some more time to go before harvest based on those white pistils, so you'll have some more growth. But sometimes buds just don't fatten up as much as you might like; it can be genetics, but it can also just be that you'll experiment with nutes and various techniques to see what particular strains really respond to.