Hey Saurabh, I guess there is no limit to upload pictures on your blog ... But, as far as I know I have uploaded upto 68 pictures in one of my blog ... And I guess that's more than sufficient ... Or if I have a lottt to share, then you can part the blog and make it as part 1 and part 2 and share your trip ... Happy Blogging and Happy Travelling Bro!!!
There is no limit to how many photos you can add. But if you a lot of beautiful images to upload, it is advisable to upload them in more than 1 trip numbered as part-1, part-2 etc.
This method has two advantage
1. It is easy to make 2-3 short Blog rather than one lengthy blog. And also users find short Blog more convenient.
2. The value of the image would be retained. If you upload a lot of images, the viewer will most likely not be interested enough to look through the last series of images.
So, keep it simple and keep it short.