Can I find some high resolution images myself as a dataset for training?

[siknet]

I am a newbie and I am learning, so I would like to ask you guys.
The original text of the training part of Real-ESRGAN ( https://github.com/xinntao/Real-ESRGAN/blob/master/docs/Training_CN.md) is as follows

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We use DF2K ( DIV2K and Flickr2K ) + OST dataset for training. Only HR images are needed!
Here is the link to the website:

DIV2K: http://data.vision.ee.ethz.ch/cvl/DIV2K/DIV2K_train_HR.zip
Flickr2K: https://cv.snu.ac.kr/research/EDSR/Flickr2K.tar
OST: https://openmmlab.oss-cn-hangzhou.aliyuncs.com/datasets/OST_dataset.zip

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I see that DIV2K has only 800 images and Flickr2K has only 2000 images, is this enough data? Wouldn't it be better for me to get a few thousand images of the same/better quality to replace them?

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