Borrowing figures from the literature In my dissertation, I have felt the need to illustrate some ideas with the help of figures and illustrations which I have found available in existing literature. I have borrowed a number of them and I give proper citations and everything. My question is:

Will it be considered a negative point to have multiple borrowed figures from existing publications?

Also, in two cases, I found it hard to rephrase the captions for the images and I just quoted the captions(the proper way). 
Does that look like I am being lazy?
The issue here is not "laziness"; the real issue with reusing figures from the literature is that, without appropriate permissions, you do not have the right to do so.

If you reuse a figure in the literature without the appropriate permission from the rights-holders, you are effectively stealing their work, which is not allowed. Therefore, you need to make sure that you have gotten the right to use the figures, and have the proof to back it up if challenged. Normally, for scholarly works such as theses, such rights are routinely granted and cost-free. However, you need to check with the publisher (or author of the paper, if she holds publication rights) before using the figure. Then, next to the figure you are reproducing, you'll need to have a statement such as "Figure reprinted by permission of X," where X is the person or institution authorized to grant reproduction rights.