Load more button

http://www.asmithillustration.com

On my site made using the Wells template I have a large portfolio page with lots of small thumbnail images. Theres about 150 images so it takes a long while for them to load in sometimes. Is there someway I can get perhaps 75 images to appear and then a 'Load more' button beneath them so that the rest can then be loaded? 

Thanks for replying Tuanphan. I am on business starter plan. Either of these options sound good, on the first solution the second page would need to appear under the first page so you see all the images as one continuous scroll. How would I go about doing this?

First solution, both are different page, and add a load more button under, click on it >> open another page