The most important thing you will want to do when using images is to make sure, y'know, that you are actually using images. Nothing is more embarrassing than showing off your website or research guide and seeing the dreaded broken image icon. Wah wah wah waaaaaah.
LibGuides allows you to upload images, so this will solve the problem 99% of the time. If possible, don't link to images on other websites as those images may disappear.
When resizing images, make sure you keep the changes proportional to one another. With LibGuides, it is super easy to avoid stretched images. When you upload or edit image properties, you'll notice a lock icon next to the dimensions.
Just make sure the lock is...locked and whatever number you type in for WIDTH will auto-populate in HEIGHT to keep the proportions intact. And vice versa.
Don't you want to see Michael J. Fox and his boyish good looks in all of his high-resolution glory? When you upload pictures and want to resize them to a larger size, it is important that you are using high-resolution images. If an image is originally 100 x 100 and you need it to be 300 x 300, it is going to look pixilated and blurry. When searching Google Images, limit your results to only larger photos to avoid potential blurriness issues.