There is no need to ask for permission if you want to use one or several of them for personal purposes (e.g., for your website, facebook profile, for hanging prints on your wall or using them for tattoos).
If you are a church or other Christian organization, you do not have to ask for permission if you use them in any way during service, other activities or, for example, printed on T-shirts, mugs and similar things - even if you sell these things to raise money for your church or needy people.
These permissions also cover modifications in color or shape.
If you want to use them for other purposes, e.g., in or on magazines, commercial websites, books, CD covers, you have to ask for permission. It is extremely unlikely that I will ask you for a fee or royalties. Actually, so far, I never did. But I want to know where the pictures are used and have a chance to prevent improper use.
To get such a special permission, email me (firstname.lastname@example.org).
Your permission is obviously non-exclusive, and no copyrights are transferred.
Whenever possible/appropriate make people aware of where you got the pictures by referencing my website www.freymanc.com.