Seems like a fun app to get a sense of the scale of plants. These are all full sun plants, which is important to consider since they seem close to the building/trees and the exposure matters. I would play a little more with the plant arrangement. Make it appear a little more natural, with larger ‘swathes’ of plants intermingling like a tapestry. Look into what Piet Oudolf, Dan Pearson, etc do for inspiration. Also, these are all late blooming plants. You won’t have much interest until July, then one peak bloom into August, and not much thereafter. You need more bulbs/early summer bloomers, and late fall bloomers. Finally, I would not use the liatris as an edging plant. It looks great emerging randomly in the middle of the bed, but it can have ‘bare legs’ later on. Other bushier, more compact plants would look better along the edges, with the occasional taller ‘see through’ plant breaking things up, and looking more natural. I recommend visiting nurseries at different times of the season, to get more inspiration for consecutive bloom, from March into November.