Hey annyyyyy, Nice job on these drawings, especially the second one, it has great dimension. The thing I noticed the most is that you need to use anatomical details to help sell your perspective. The way a muscle wraps around the form, or creases in the skin can help show perspective. Also, in the first drawing, the figure is lacking any sense of structure. Try looking for places to put corners and other details to show the underlying structure of the body or form. Make sure in a symmetrical pose like this one, that both sides of the body are close to being the same. I did a quick sketch and diagram to show you some of the things I am talking about, I hope it helps :)