I like them but you can do better ,especially the 2ⁿᵈ and 3ʳᵈ drawings , your construction boxes are not cubical.
Your isometric boxes are totally fine, but your parallel lines need a little bit of work(refer to drawing no. 3), but overall, nice job!
Your sketch of the tissue box looks realistic,but can improve on your straight lines in drawing no.2
your lines are really bendy, you should really straighten them up.