(can anyone tell me why my photos still look small here compared to other members' photos, altho mine are above 90kb)
There are two ways to display photos, cheng. Attachments (which you used) and links. With a link, the photo is stored on another website so it doesn't eat up bandwidth on this site. Each time a message is displayed on this site, the server fetches the picture data from the other site and displays it at the size it is provided, so all that is stored here is a small instruction about where to find the picture. (That explanation is probably totally wrong, but it's how I think about it!).
I think there is a topic explaining picture links, but I couldn't find it when I had a quick look just now. What you need is an account at an image-hosting website (I use photobucket, where you can get an account for free). You upload your pictures to their website, copy a link for each picture onto your clipboard and paste it into your message here at PF, using the 'image' button (or by typing [img.] before and [/img.] after the link, missing out the dots).
Hope that helps!