Also, the simple way is just order the images without any additional tags.
Make sure that the size of the images is proportion or the same, put a space if necessary and next line/enter if you want the images show below or above. If you want to show them center then just put the images in the "center" tag
[img]https://i.imgur.com/W9hbTRV.png[/img] [img]https://i.imgur.com/W9hbTRV.png[/img]
This approach only works well if image size is similar (almost). If image sizes are different, then you will have unaligned rows because basically it is not set up as a table. With a table format, you will have all align in row and column, no matter what size of images.
Additional parameters should be included into your approach, with both width and height parameters. Something like
[img width=300 height=200]https://i.imgur.com/W9hbTRV.png[/img] [img width=300 heigth=200]https://i.imgur.com/W9hbTRV.png[/img]
Else, in case image sizes are different, you will get something like below
[img width=200 height=100]https://i.imgur.com/W9hbTRV.png[/img] [img width=200 height=100]https://i.imgur.com/W9hbTRV.png[/img]