General Art I Made

This is definitely not all my art, as I would have to upload it all to Imgur. But perhaps in the meantime I can link images from other sites I've posted on?
To make sure this page loads smoothly, I want the image thumbnails to be 200x200 pixels at their largest. So far I've had to resize and position each one manually. I'm aware the images are visually shrunk and cropped, but I found it loads faster when the preview image has a smaller file size.
Let me know if you have any advice!