OK, I'm brand new at this book cover thing. I was contacted by the author via email - he saw my website and liked what he saw. He is a self-published author, is on his third book, and wants me to do the cover art.
We have a good rapport - he was a CPA and I am one, and we both like dragons

He told me what he wants for the cover, and the format/size, etc. He has no problem with non-exclusive rights, and offered $1000 for the use of two formats of the cover (one for US, one for China bilingual edition). It will be digital, we've agreed on the size, and I've written up a contract.
Can anyone tell me if I'm missing something major? Here is what I've done so far. Thanks for any help or advice!:
LETTER OF AGREEMENT
I hereby grant (Name of other party) the non-exclusive right to use the following artwork on his books:
(list titles of artwork)
I agree to deliver my artwork to (name of other party) as a 300-DPI graphics file (.TIF format or .JPG at highest resolution) in 8”X11” format, and another in 16”X9” for the Chinese edition via FTP, CD-ROM, or other mutually agreed upon delivery method. I will also provide a smaller version for use on the internet.
All rights to the original artwork remain with me, including but not limited to all poster, print, and other display use rights. (Name of other party) has the rights to print the artwork on his initial publication of the book in the US and in China. The payment for this use will be $1000.00, with a deposit of $250.00 due upon the approval of initial sketches. The remainder will be due upon the approved final pieces. In addition to the cash payment, I will be due two (2) copies of the published work.
Subsequent publiciation of the book in these or other markets or formats (such as CD-ROM) will be subject to an additional fee of $100.00 per publication. (Name of other party) has the rights to use the image in promotional material for his publication, including on websites and in catalogs.
I will be credited on the back cover or inside the book as the cover artist.
I hereby affirm that all artworks covered under this agreement are original and created by me, that I own the rights granted under this agreement, and that the rights granted hereunder are not encumbered by any other agreement which would conflict with this agreement. I indemnify and hold harmless (Name of other party) from any fees or damages resulting from a finally sustained lawsuit brought against the use of my artwork due to plagiarism or other theft.
Sign here: ______________________________