下手の横好きで撮影している写真を日記とともに紹介しています。

。

I'm sharing photos I take as a hobby — though I'm not very good at it — alongside diary entries.

Literal

Clumsy-person's-sideways-liking [with-で] shooting photos [object-を] diary [together-with-とともに] introducing.

下手の横好き ('a clumsy person's sideways liking') is a self-deprecating idiom for loving a hobby you're bad at. The full proverb implies that enthusiasm compensates for lack of skill. 撮影している modifies 写真 as a relative clause. とともに links the photos and diary as co-presented content.