Hi Ftard cannot give you any advice from your photo's other than to say a very well cut suit will stay relatively still when you lift your arms. Your suit is trying to fly over your head. However post a side on a front on and a back on and stand naturally (not upright as if on a parade ground) and I will be happy to offer some advice for what it's worth
there is, in my humble opinion nothing wrong with the overall slim line. You don't look as big to me as you couldn't wear some shaped jackets. But unfortunately, your MTM service did not get the measures right.
Lets start from the back, top down: The shoulder crease in the right shoulder (from the back side picture) clearly comes from a spine with is not straight but slightly s-shaped (from left to right to left again, not the natural curve but looking from the back side frontally on it!). Not clear to my eye if it is posture on the pic or permanent. The horizontal creases below the neck are a sign of a wrong measurement, too. It is at least half an inch too narrow in the upper section. Above your waist, again creases, this time too much fabric in that area. Overall length is according to current standards (a bit shorter than in previous years. Unfortunately not too appropriate with a formal suit).
The front of the jacket: Same creases on shoulder from stance or spinal problem, which leads to the conclusion, that it is a spinal / orthopedic issue, which your tailor or your doctor should take care of, in the long run, the doc option is cheaper, as I may add). Chest area looks fine again until the lower section of the left lapel (in the pic, so your right lapel). Too much fabric there, which in co-operation with a too tight upper button section makes for the crease.
Arms: Armholes could be a bit narrower but this step has to be well thought of. On a suit you want to wear often armholes too tight lead to premature fatigue of the cloth due to the constant movement of the arms along the chest. So a bit more is ok. But not on a formal suit with which you probably whish to dance in! Arms in general are too roomy and not correctly positioned as you can see from the flow of the fabric pulling on the front side and creasing on the back of your upper arm. These must be taken out, drawn around until the fit with a fluid non-creasing fall and then be resewn.
I apologize for my bad language! I am not english mothertongue. And of course for the lenghty post.
Very welcome. Appreciate your comments. Should you find it useful me having a comment on the trousers fit, respectively not exactly fitting areas, just let me know.
So in order to clarify my point with your spine, could anyone not as computer stupid as me do us a favour here and dram a thin red line into that photo with f-tard standing with the back towards the photographer? the vertical line should meet the neck thread of the jacket in the middle and run down straight. Same (with the neckties knor as center) for the full front shot. I will then be able to explain i bit further what alteration might help to balance this posture.
@ Lysandar: Actually not, it is much more than just a dropped shulder, the whole upper body has a slight C-shape as you will notice when looking at the creases in the torso under (left to) the right arm. The suitmaker simply did not take the proportions into account. And this is why people turn to MTM or bespoke, right? Otherwise they could go for OTR. I would not accept such a big mistake as a client.