Please give me some feedback on my mittwork (video included)

[krotala]

Hello everyone.
I've been reading this forum for a while now but I just recently joined.
I'm 37 and I've been practicing boxing for about 7 months now. I really want to improve as I have 0 fights. I'm a stickler for detail and will not compete until I feel that I'm 100% prepeared, so please feel free to pick me apart and give me suggestions.

From this video I think that my posture is sometimes not correct, as I'm leaning too much for the straight cross. I also think my chin and head are maybe a bit too close to my sternum thus sacrificing oral stability.
Maybe the left hand too close to my chin, and my stance a bit too open (whole body facing my opponent).

Thanks for the feedback in advance and here's the link: