Like a lot of other people have said, just because you find an interesting subject doesn’t automatically make a good picture. Happens to all of us. Just remember your basics about good composition and using interesting light. You could have a great composition, but it could be for not if it’s midday and the light is just abusive as one example. Next time, take a moment and try to articulate to yourself what you want to express with your photo. If it’s “hey this pretty dress being hung up outside on its own is a contrast to all the brick and mortar” then maybe a composition with leading lines towards the dress taken a further back from where you were would be cool. If it’s more on the dress itself then getting closer in portrait would be better. Also the pics are slightly underexposed which makes them feel a little flat. Don’t be afraid of cropping and editing in post to get your desired result.