I really like the square mono version.

No. 3 for me too, as there's more of the tips of the grass in it, the composition is more pleasing to my eye than the first two. I really like it. The red flowers in the backound are slightly distracting though.

It looks great to me, agree with Robbies comments. However, I think it looks nicer the other way up!

Thanks for the comments! Often it's difficult to know if you are getting something right without some external input, so it's great to get feedback.

Here's the original colour version. Personally I much prefer the conversion.

This is a slight crop of a pic in my gallery. He's a feral cat that we adopted (along with two others!) I like the picture, but am intersted to know what other people think of it. I wanted to capture his eyes, so changed the rest of the pic to mono. I would welcome some honest comments: is it too cliched, or badly composed? I think I may have over-sharpened it a bit.
Shot with a Tamron 90mm and 2x converter, purely because it happened to be on the camera when I decided I wanted to take the picture.

My other half has one (SLR model), doesn't work too well as a tripod but it's great for tying your camera to trees, fences, in fact anything you can wrap it's legs round.

Pictures taken in light that is not very good in colour often look great in mono. It can also enhance strong shapes in a picture and make distracting backgrounds less prominent.

That looks much better, perhaps a crop on the right midway between this and the original? I would also burn the darker bits on the tree trunk just a little.

PS my other half, Aurora B, prefers the original!

Looks a bit blue to me too. I think it would look better in mono anyway.

Placing a bit of matte black card or translucent dark plastic in the right position against the glass, is a technique I have used successfully when shooting through windows. Often you can get away with just placing the card or plastic between the object being reflected and the glass, without having to push it against the glass. Choose an angle where you can both hold the card in the right place and get your shot, or take someone with you to hold the card. For obvious reasons this works best if you use a longer focal length, eg 55mm as opposed to 18mm on a standard kit lens.

A polariser could be an option as Tim suggests, but you might end up with light problems, unless the light in the museum is very good.