The only thing that caught my eye is that the tracks on the Churchill are on backwards. Just google Churchill Tank and you will see what I mean.

Nice work!

To add to Roy's comments did you leave the co-axial MG off the the Churchill? And looks to me like the tools are painted the same colour as the hull? Still not knocking you really nice work there, like the weathering- little dirt and grime but not over the top. I picked up the AFV Club Churchill and am now thinking I should have bought another Tamiya one too- the AFV Club kit has a bajillion parts just in the suspension alone...

And the Stryker looks good too! That blade does look like a pile of work. Frankly; I'd go the same path you did on the Churchill, some sand on the tyres, blade and around the bottom should look good. Of course there are much more skilled modelers here that can tell you more than me.  

The blade on the Stryker looks like it was a serious PITA to build.

Cool looking models.  That Styrker's gear is impressive!  One thing you might want to do in the future is beware of seams.  On the Churchill's turret face, there are vertical seams that could have used some putty -- the actual turret was one solid casting.  Lots of photos of survivors are on various sites.  Ppl will be happy to send you links so you can confirm what should stay and what should go.

Keep up the good work!