If you like the lower bar height, then the 54 was probably the right decision. If you will rather have a higher bar height, then a 56 in that same model might have been better. But either way not a big deal unless you need the most extreme opposite position that the two could give you. For any upper body position in between, Either size can be made to get you the fit you want or need.

I'm 180cm with long legs. And I bought the smaller of two sizes for the model bike I wanted. Because I wanted the lower frame stack to have my bars lower than I could have gotten them on the next size up. And because I knew I wouldn't like the longer 175mm crankarms that came with the larger size bike. The 172.5mm crank arms on the smaller size bike I might have gotten use too. But I still decided to change them anyway since I already had cranks of the 165mm length I prefer.

If you don't have any complaints about numbness or pain. Or find yourself wondering if there is a better position for you to put out more power and be more aerodynamic, there is really no need to worry about fit. It looks okay. Though for longer rides you might get numb or sore hands and wrists with your somewhat straight arms. If you can't get use to keeping more bend in the elbow , then putting a longer stem and raising the bars might might stretch your arms out to a angle that will let more of your body share the bumps and other stuff that work on your hands and wrists.

I also think you should have your saddle fairly level with little tilt. To me, noticeably tilted saddles are a sign that other things about your fit need to be changed. Sometimes the saddles setback. Either more or less. You can experiment with where you put the clamp in the rails. If you were to have the saddle all the way to the extreme range on the rails, then that might suggest you need a different setback on the post.

Often, what is comfortable for short rides, isn't comfortable for long rides. So consider that when changing things up.

If you have a actual complaint, then let us know. Or someone local to you know. Numbness should be dealt with immediately. As should sores on skin that might be from your riding posture. It's not something you should think you'll get use to. Very minor pain, particularly a sore butt might be a indicator you just don't ride often enough or are too new to cycling.

Exercising your glutes, upper arms and shoulder girdle through their full range of motion when off of the bike will go a long way to keep you comfortable when on the bike. Particularly after you retire or when your physical activity for other things starts to slack off.

I'm not a fitter. But I have fit myself to all my bicycles very well since my first bike before kindergarten.