Ohhhh I see. It's a JCS screenshot. In that case the effect is from something entirely different. JCS does not render transparency. Instead it just removes half the pixels so you can see through it.

As for the best way to upload the tilesets, I recommend simply putting them in a zip file and sticking it on j2o as one big pack. And it would probably be a good idea to set the upload to not accept reviews, and instead tell people to rate the individual tilesets that were uploaded by Waz himself. And if you want to put in extra effort, you can link to all the individual uploads in the download info.

I think uploading in this way would be fair. I think it would be a good idea to upload them too.