Two options for ya 1917. Type you post up in a word processor, I use 'Word'....even pasting the links to your pictures. Read it, spell check it....when happy, copy and past it to the forum. I say this, but rarely do it, as anyone can deduce by reading some of the krap I post.
Another thing you can do is click on the 'Go Advanced' button and compose your post in the enhanced window. At the bottom of the page (below all the icons) there's a button that'll allow you to Preview your Post....prior to actually posting. It'll show up just as it will as if you posted it....showing all the pictures, etc. This works pretty well....and I just started using it (after 6 years of not noticing it was there).