Aqua Portfolio is a free specialized WordPress theme for a portfolio. The most interesting fact about this theme is that you can exhibit your every photograph in the most stunning and extensive way.
Besides the special and lively layout, Aqua Portfolio is also an easy-to-use theme that you can use right after installing.
The strength of Aqua Portfolio is that it's specially built for a portfolio or any rich-media page. The speed is acceptable and the Gutenberg will help you edit posts easily.
The list of custom features is short but I think a small number of customizable things can help you save your time. Lastly, this free WordPress theme isn't a feature-rich theme so you should update to the pro version after trying the free version.