Hmm maybe we're straying out of topic here but with regards to your technical reasons etc...
Yes compression can and does do strange things to your pictures, but your audiences won't see it. You can give excuses and perhaps very valid reasons for why your pictures don't look the way they are supposed to but you are judged on your final product.
Likewise with poses, lighting and composition, these things don't change with how you process or en/decode them, but I could be wrong, because this is how it is in my world I don't know about yours.
You can blame the final results on many things, these things like computer software and hardware eventually might improve as they always do given time, but I'm afraid your standard might stay the same if you don't change one very fundamental thing - and that is the photographer.
That said you are very brave to post your work here because I don't dare so you might want to take my words with a pinch of salt since there's probably something you know that i don't.