Hi, thank you for posting. Overall these are not bad. I like your use of gouache for the highlights, don’t overdo it though. Also before starting a drawing, think about what the most communicative view is for the product. Probably not upside down! You almost have the perspective right on the controller - not an easy design - keep practicing. And find a middle way between showing all construction lines or aiming for a clean drawing. I like how you sharpened the contours on the iron, that is definitely your best sketch.
You are right! My perspective is not very good and I think I always make my perspective very exaggerated. I sketched the iron for 3 times, that’s why it looks better???