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@Walent:  Wow - really appreciate you taking the time mate - thanks a bunch :).

mnope, the top muscle you labeled is not the erector spinae, that's actually where the fibers of the lats end and the fascia begins, so that's why you see the plane change. At least that's what I manage to see through that watermark. I suggest trying to find reference that shows muscles a bit better, flexed poses and better lighting. Otherwise it won't help, because you'll have to invent the muscles.

Yes I see now that I had an incorrect understanding of the erector spinae.  Also - great tip on using more ripped references - I guess I was trying to get used to rendering a thin layer of fat over the muscles - but in order to do that I need to understand the muscles first!

Also, now that I see the reference, I can see you pushed the scapulas too much towards the lateral side. In this pose, the opposite happens, the arms go back so the scapulas go closer to the spine and the rhomboids and trapezius bulge. 

I know back muscles are freaking hard, I consider them second hardest, after the forearm extensors. So look out for the scapula movements, it's pretty important.

Hmmm - I used the teres major to locate the bottom of the scapulae here but I've just done a bit more research and the scapulae actually extend slightly more medially than the medial tip of the teres major so considering this along with the position of the arms,  I see now that the scapulae should be more medial than I have them - thanks :).

On the left image, you can clearly see the medial end of the latissimus fibers. The erectors create just a slight bulge close to the spine (that's their function, help hold the spine)

Try studying these.

Many thanks dude - great refs.  I will give these a study :).

Oh, I also noticed you ignored the serratus, you should look out for that one too, because it creates some surface as well and it got me pretty confused at first. You can basically see it in the right image, under the right scapula and above the fiber ending of the lats, going down from the medial border of the scapula. So there are also a lot of rhythms there, those will help a lot with positioning.

Hey you're so right!  I forget that the serratus wraps around to the back - I'll shall give this a study.

Anyway, hope this helps and hope it's not too much info.

Oh man it really helped - thanks a shed load Walent :).