These are some mechas or something I drew. I'm still learning, I guess. Any suggestions on how to improve?
Mecha 1
Mecha 2
Mecha 3
Mecha 4

You have some really cool ideas but I fell that you give more importance to this ideas (that are more like details) and not the main scheme, you should make a sketch first, make it fast, make it fluid, use basic forms, have in mind the anatomy you want to give to it so when you finish you'll have the concept very clear this is the most important espect in a drawing then you could do the details