Hi Sumistha,
It’s good to see that your perspective work has improved as well, especially the ellipses.
You can still improve on this as well as on the proportions for example in the lines you draw midway across the forms.
This communicates very well if done properly.
So far as a recap I like your June 7 headphone sketch the best because the first sketch was freehand, loose and simple yet still accurately describing the design intent. It is great that you are also practicing presentation hand rendering - yet exploration and presentation are different types of sketching and have to be in different threads as do discussions about your design projects. Your June 24th camera sketches also were not bad except for the ellipses and your 08/28 mice sketch with blue pencil also works well. Make it clear what you are improving on and keep posting!