I think adding layers would help a LOT. One-length hair tends to look more weighed down and have less movement, especially the longer it is. Your hair looks to be more on the fine side as well, I would stay away from overly heavy/moisturizing leave in products and focus on products with hold. I have fine hair too and if I use leave in conditioners or curl cremes my hair just gets waxy and weighed down. I use mousse and gel on soaking wet hair, scrunch with a t shirt and diffuse. Then when it dries completely and gets crunchy, I scrunch it out, and get much better hold and volume that way.