IMO - Certainly not too big, in fact I would have the saddle up a touch assuming you are sitting centrally. In the first two photos your elbows look locked which will cause you shoulder pain, try and have them bent slightly like you have on the drops (3rd photo). Saddle comfort can be tricky, there is a certain amount of toughening your arse up and breaking a saddle, but there is also very much saddles that you will never find comfortable. I think I went though about 10 different ones before I got my Goldilocks one, my perfect saddle could be your worst nightmare. Before you start with trial and error on a saddle you can do try and narrow things down my measuring your sit bones. This can be done in a shop with a special gel cushion or you can sit on the soft stair carpet with your knees up high on some tinfoil and measure the dents. Ideally, you find a friend with a stack of saddles and test them out on your bike. Failing that a lot of shops have a demo fleet of saddles to try.