I just looking for some useful books to beginning of my painting career. I have only basic skills at digital painting, you may see that on my last public piece:

http://tr79.deviantart.com/#/d36sw2p

I try to focus at firstly to speedpaint/ landscape. Not to try start painting with characters, or sci fi or etc. And base on this I need from you recommendation which book will be probably the best for me at this time. Need to gain some basic techniques exactly rather these which I could perfectly use on environmental speedpainting and give me strong knowledge to start a digital painting at higher level.

I just looking to these:

http://www.amazon.co.uk/gp/offer-lis...&condition=new
http://www.amazon.co.uk/gp/offer-lis...&condition=new

or

http://www.amazon.co.uk/gp/offer-lis...&condition=new
http://www.leboxshop.com/product_p/book_spspark.htm
http://www.amazon.co.uk/dp/2359470000?tag=parblo-21

So, can you give me some review of these books?

Thanks a lot...