the various dimensions and calibres are a bit "all over the shop", and the infobox ones don't match either, despite the note. One says 200 inches, and some are abbreviated where they should be in full. I suggest adopting either metric or imperial measurements as the first one listed in conversion templates throughout the article. Also, suggest providing ranges of dimensions if the two ships varied significantly.
2a. it contains a list of all references (sources of information), presented in accordance with the layout style guideline.
2b. reliable sources are cited inline. All content that could reasonably be challenged, except for plot summaries and that which summarizes cited content elsewhere in the article, must be cited no later than the end of the paragraph (or line if the content is not in prose).
The licenses are not supported by the information in the descriptions. Date of death of author assumptions or an alternative PD license is needed. Both need fixing. The second one is probably {{PD-art-US}}, but you'll need to make the argument about the likely death of the photographer and 70 pma for the first one.
The first one should be sorted out, but the second one I'm not so sure about. The PD-art-US template only applies to photos of paintings (I think) so {{PD-US}} should be more appropriate, but I don't know about the Austro-Hungarian part. I can't find anything out about the author, not even his first name. I'd say since the painting was done in 1895 at the latest (and it's very likely that it was done closer to the time of the battle), it's highly improbable to still be under copyright in Austria, but if you'd be more comfortable if I moved it to en.wiki, I can do that.
I've tweaked the description of the first one, I think a reasonable case can be made for PD-Italy and PD-URAA. The second one, well, ok, I don't think it would sail through ACR or FAC as it stands.